Quarterly report pursuant to Section 13 or 15(d)

Earnings (Loss) per Common Share (Diluted Net Income (Loss) Per Share) (Details)

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Earnings (Loss) per Common Share (Diluted Net Income (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Class A        
Numerator:        
Undistributed net income (loss) allocable to common stockholders for basic computation $ (7,957) $ 6,880 $ (66,197) $ 10,834
Reallocation of undistributed earnings (loss) as a result of conversion of Class B to Class A shares (774) 677 (6,545) 1,035
Reallocation of undistributed earnings as a result of conversion of dilutive securities 0 141 0 447
Effect of derivative instrument that may be settled in cash or shares 0 (2,827) 0 (9,327)
Effect of share based compensation that may be settled in cash or shares 0 (32) 0 (93)
Undistributed net income (loss) adjusted for allocation of undistributed earnings (loss) and effect of contracts that may be settled in cash or shares $ (8,731) $ 4,839 $ (72,742) $ 2,896
Denominator:        
Number of shares used in basic computation (shares) 31,374 32,033 31,291 33,008
Conversion of Class B to Class A common shares outstanding (shares) 3,052 3,154 3,094 3,154
Effect of derivative instrument that may be settled in cash or shares (shares) 0 264 0 602
Unexercised stock options (shares) 0 1 0 3
Effect of share based compensation that may be settled in cash or shares (shares) 0 26 0 26
Number of shares used in per share computation 34,426 35,478 34,385 36,793
Diluted net income (loss) attributable to GCI common stockholders per common share (USD per share) $ (0.25) $ 0.14 $ (2.12) $ 0.08
Class B        
Numerator:        
Undistributed net income (loss) allocable to common stockholders for basic computation $ (774) $ 677 $ (6,545) $ 1,035
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 (247) 0 (787)
Effect of derivative instrument that may be settled in cash or shares 0 0 0 0
Effect of share based compensation that may be settled in cash or shares 0 0 0 0
Undistributed net income (loss) adjusted for allocation of undistributed earnings (loss) and effect of contracts that may be settled in cash or shares $ (774) $ 430 $ (6,545) $ 248
Denominator:        
Number of shares used in basic computation (shares) 3,052 3,154 3,094 3,154
Conversion of Class B to Class A common shares outstanding (shares) 0 0 0 0
Effect of derivative instrument that may be settled in cash or shares (shares) 0 0 0 0
Unexercised stock options (shares) 0 0 0 0
Effect of share based compensation that may be settled in cash or shares (shares) 0 0 0 0
Number of shares used in per share computation 3,052 3,154 3,094 3,154
Diluted net income (loss) attributable to GCI common stockholders per common share (USD per share) $ (0.25) $ 0.14 $ (2.12) $ 0.08