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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Common Stock - Class A [Member]        
Class of Stock [Line Items]        
Allocation of undistributed earnings (loss) for basic computation $ (14,330) $ 5,156 $ (32,048) $ 6,172
Reallocation of undistributed earnings (loss) as a result of conversion of Class B to Class A shares (1,297) 451 (2,848) 541
Reallocation of undistributed earnings as a result of conversion of dilutive securities 0 2 0 1
Effect of share based compensation that may be settled in cash or shares 0 (5) 0 (2)
Net income (loss) adjusted for allocation of undistributed earnings and effect of contracts that may be settled in cash or shares $ (15,627) $ 5,604 $ (34,896) $ 6,712
Number of shares used in basic computation 34,887 36,143 35,548 36,112
Conversion of Class B to Class A common shares outstanding 3,159 3,162 3,159 3,163
Unexercised stock options 0 122 0 121
Effect of share based compensation that may be settled in cash or shares 0 26 0 26
Number of shares used in per share computation 38,046 39,453 38,707 39,422
Diluted net income (loss) attributable to GCI common stockholders per common share $ (0.41) $ 0.14 $ (0.90) $ 0.17
Common Stock - Class B [Member]        
Class of Stock [Line Items]        
Allocation of undistributed earnings (loss) for basic computation $ (1,297) $ 451 $ (2,848) $ 541
Reallocation of undistributed earnings (loss) 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 0 (2) 0 (2)
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 $ (1,297) $ 449 $ (2,848) $ 539
Number of shares used in basic computation 3,159 3,162 3,159 3,163
Conversion of Class B to Class A common shares outstanding 0 0 0 0
Unexercised stock options 0 0 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 3,159 3,162 3,159 3,163
Diluted net income (loss) attributable to GCI common stockholders per common share $ (0.41) $ 0.14 $ (0.90) $ 0.17