CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Network operations, equity-based compensation expense	$ 604	$ 573	$ 584
Selling, general, and administrative, equity-based compensation expense	$ 12,686	$ 10,162	$ 10,931