Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Diluted EPS calculations) (Details)

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Business and Summary of Significant Accounting Principles (Diluted EPS calculations) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Common Stock - Class A [Member]        
Class of Stock [Line Items]        
Undistributed income (loss) allocable to common stockholders for basic computation $ 15,293 $ 8,635 $ (15,838) $ 14,818
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares 1,418 754 (1,427) 1,296
Reallocation of undistributed earnings as a result of conversion of dilutive securities 22 2 0 3
Effect of derivative instruments that may be settled in cash or shares (18) 0    
Effect of share based compensation that may be settled in cash or shares 4 (3) 0 (4)
Net income (loss) adjusted for allocation of undistributed earnings and effect of contracts that may be settled in cash or shares $ 16,719 $ 9,388 $ (17,265) $ 16,113
Number of shares used in basic computation 34,031 36,220 35,037 36,149
Conversion of Class B to Class A common shares outstanding 3,155 3,162 3,158 3,162
Unexercised stock options 122 120 0 120
Effect of derivative instruments that may be settled in cash or shares 781 0    
Effect of share based compensation that may be settled in cash or shares 26 26 0 26
Number of shares used in per share computation 38,115 39,528 38,195 39,457
Diluted net income (loss) attributable to GCI common stockholders per common share $ 0.44 $ 0.24 $ (0.45) $ 0.41
Common Stock - Class B [Member]        
Class of Stock [Line Items]        
Undistributed income (loss) allocable to common stockholders for basic computation $ 1,418 $ 754 $ (1,427) $ 1,296
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares 0 0 0 0
Reallocation of undistributed earnings as a result of conversion of dilutive securities (34) (3) 0 (5)
Effect of derivative instruments that may be settled in cash or shares 0 0    
Effect of share based compensation that may be settled in cash or shares 0 0 0 0
Net income (loss) adjusted for allocation of undistributed earnings and effect of contracts that may be settled in cash or shares $ 1,384 $ 751 $ (1,427) $ 1,291
Number of shares used in basic computation 3,155 3,162 3,158 3,162
Conversion of Class B to Class A common shares outstanding 0 0 0 0
Unexercised stock options 0 0 0 0
Effect of derivative instruments that may be settled in cash or shares 0 0    
Effect of share based compensation that may be settled in cash or shares 0 0 0 0
Number of shares used in per share computation 3,155 3,162 3,158 3,162
Diluted net income (loss) attributable to GCI common stockholders per common share $ 0.44 $ 0.24 $ (0.45) $ 0.41