CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Paid-in Capital [Member]	Retained Deficit [Member]	Non-controlling Interests [Member]	Common Stock - Class A [Member]	Common Stock - Class A [Member] Shares of Class A Common Stock [Member]
Beginning balances, common stock, shares issued at Dec. 31, 2015						100.0
Beginning balances, total stockholder's equity at Dec. 31, 2015	$ 210,095	$ 164,508	$ (192,033)	$ 30,998	$ 206,622
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net income (loss)	(96)		138	(234)
Distribution to General Communication, Inc.	(26,157)		(26,157)
Contribution from General Communication, Inc.	5,311	5,311
Ending balances, common stock, shares issued at Jun. 30, 2016						100.0
Ending balances, total stockholder's equity at Jun. 30, 2016	189,153	169,819	(218,052)	30,764	$ 206,622
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Cumulative effect of ASU 2016-09 adoption	7,095	18	7,077
Beginning balances, common stock, shares issued at Dec. 31, 2016					100.0	100.0
Beginning balances, total stockholder's equity at Dec. 31, 2016	140,917	161,310	(257,544)	30,529	$ 206,622
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net income (loss)	(23,482)		(23,247)	(235)
Distribution to General Communication, Inc.	(11,258)		(11,258)
Contribution from General Communication, Inc.	8,438	8,438
Investment by non-controlling interest	2,709			2,709
Ending balances, common stock, shares issued at Jun. 30, 2017					100.0	100.0
Ending balances, total stockholder's equity at Jun. 30, 2017	$ 124,419	$ 169,766	$ (284,972)	$ 33,003	$ 206,622