Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Changes in issued Common Stock) (Details)

v2.4.1.9
Business and Summary of Significant Accounting Principles (Changes in issued Common Stock) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Common Stock [Roll Forward]    
Shares issued upon stock option exercises 38us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Common Stock - Class A [Member]    
Common Stock [Roll Forward]    
Balance, Beginning 37,998us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
37,299us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B shares converted to Class A 1us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
2us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares issued upon stock option exercises 38us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
19us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Share awards issued 572us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
1,119us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares retired (1,091)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
(26)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares acquired to settle minimum statutory tax withholding requirements (60)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
(24)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Balance, Ending 37,458us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
38,389us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock - Class B [Member]    
Common Stock [Roll Forward]    
Balance, Beginning 3,159us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
3,165us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Class B shares converted to Class A (1)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
(2)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Shares issued upon stock option exercises 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Share awards issued 0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Shares retired    0us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Shares acquired to settle minimum statutory tax withholding requirements 0us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
0us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Balance, Ending 3,158us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
3,163us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember