Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

v2.4.1.9
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Class A and B Shares Held in Treasury
Paid-in Capital
Retained Earnings
Non-controlling Interests
Class B Common Stock
Class A Common Stock
Beginning balances, total stockholders' equity at Dec. 31, 2011 $ 173,647us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ (2,225)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 32,795us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 97,911us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 16,308us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 2,679us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 26,179us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 9,162us-gaap_ProfitLoss     9,673us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(511)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Common stock repurchases and retirements (17,611)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 90us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
        (17,701)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares issued under stock option plan 2,118us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised           2,118us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Issuance of restricted stock awards     (12,104)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      12,104us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Share-based compensation expense 5,072us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   5,072us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Issuance of treasury shares related to deferred compensation payment 580us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued 511us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
69us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Investment by non-controlling interest 16,461gncma_NoncontrollingInterestIncreasefromInvestment       16,461gncma_NoncontrollingInterestIncreasefromInvestment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Other 7us-gaap_StockholdersEquityOther 7us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
      (3)us-gaap_StockholdersEquityOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
3us-gaap_StockholdersEquityOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Ending balances, total stockholders' equity at Dec. 31, 2012 189,436us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (1,617)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
25,832us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
107,584us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
32,258us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
2,676us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
22,703us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 31,727us-gaap_ProfitLoss     9,406us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
22,321us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Common stock repurchases and retirements (17,208)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 130us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
        (17,338)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares issued under stock option plan 622us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised           622us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Issuance of restricted stock awards     (5,477)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      5,477us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Share-based compensation expense 6,525us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   6,525us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Issuance of treasury shares related to deferred compensation payment 621us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued 621us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
         
Investment by non-controlling interest 267,642gncma_NoncontrollingInterestIncreasefromInvestment       267,642gncma_NoncontrollingInterestIncreasefromInvestment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Distribution to non-controlling interests (22,011)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders       (22,011)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Other           (3)us-gaap_StockholdersEquityOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
3us-gaap_StockholdersEquityOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Ending balances, total stockholders' equity at Dec. 31, 2013 457,354us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (866)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
26,880us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
116,990us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
300,210us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
2,673us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
11,467us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 59,244us-gaap_ProfitLoss     7,557us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
51,687us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Common stock repurchases and retirements (6,850)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue           (6,850)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares issued under stock option plan 466us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised           466us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Issuance of restricted stock awards     (8,529)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      8,529us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Share-based compensation expense 8,324us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   8,324us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Issuance of treasury shares related to deferred compensation payment 715us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued 617us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
98us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Distribution to non-controlling interests (50,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders       (50,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Adjustment to investment by non-controlling interest (2,131)gncma_NoncontrollingInterestDecreasefromAdjustmenttoInvestment       (2,131)gncma_NoncontrollingInterestDecreasefromAdjustmenttoInvestment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Other 100us-gaap_StockholdersEquityOther       100us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(5)us-gaap_StockholdersEquityOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
5us-gaap_StockholdersEquityOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Ending balances, total stockholders' equity at Dec. 31, 2014 $ 467,222us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ (249)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 26,773us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 124,547us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 299,866us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 2,668us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 13,617us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember