CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) [Abstract]
Depreciation and amortization	$ 469,388	$ 684,448	$ 503,662
Non-cash stock-based compensation expense	$ 32,285	$ 31,651	$ 28,299