Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity-based compensation expense	$ 22,152	$ 23,203	$ 37,515
Operating Expense [Member]
Equity-based compensation expense	7,387	7,049	11,033
Selling, General and Administrative Expenses [Member]
Equity-based compensation expense	$ 14,765	$ 16,154	$ 26,482