CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (294,486)	$ 162,664	$ 188,009
Other comprehensive loss, net of taxes of $0 for 2015, $0 for 2014 and $0 for 2013:
Foreign currency translation adjustment	(10,556)	(7,613)	(7,691)
Total comprehensive income (loss)	$ (305,042)	$ 155,051	$ 180,318