CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Common Stock Class A Common Stock	Paid-in Capital	Retained Deficit	Non- controlling Interests
Beginning balances, common stock, shares at Dec. 31, 2014			100.0
Beginning balances, total stockholders' equity at Dec. 31, 2014	$ 467,222		$ 206,622	$ 88,802	$ (128,068)	$ 299,866
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net income (loss)	(10,032)				(10,191)	159
Distribution to GCI Liberty, Inc.	(53,774)				(53,774)
Contribution from GCI Liberty, Inc.	86,218			86,218
Distribution to non-controlling interest	(765)					(765)
Investment by non-controlling interest	3,209					3,209
Non-controlling interest acquisition	(281,803)			(10,282)		(271,521)
Other	(180)			(230)		50
Ending balances, common stock, shares at Dec. 31, 2015			100.0
Ending balances, total stockholders' equity at Dec. 31, 2015	210,095		$ 206,622	164,508	(192,033)	30,998
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net income (loss)	(1,676)				(1,207)	(469)
Distribution to GCI Liberty, Inc.	(64,304)				(64,304)
Contribution from GCI Liberty, Inc.	11,247			11,247
Non-controlling interest acquisition	(14,445)			(14,445)
Ending balances, common stock, shares at Dec. 31, 2016		100	100.0
Ending balances, total stockholders' equity at Dec. 31, 2016	140,917		$ 206,622	161,310	(257,544)	30,529
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Cumulative effect of ASU 2016-09 adoption	7,095			18	7,077
Net income (loss)	31,315				31,791	(476)
Distribution to GCI Liberty, Inc.	(17,918)				(17,918)
Contribution from GCI Liberty, Inc.	17,029			17,029
Investment by non-controlling interest	6,783					6,783
Non-controlling interest acquisition	(1,138)			(1,138)
Ending balances, common stock, shares at Dec. 31, 2017		100	100.0
Ending balances, total stockholders' equity at Dec. 31, 2017	$ 184,083		$ 206,622	$ 177,219	$ (236,594)	$ 36,836