Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net loss	$ (118,371)	$ (106,390)	$ (291,116)	$ (428,412)	$ (321,742)	$ (455,016)	$ (65,121)	$ (30,663)	$ (944,289)	$ (872,542)	$ 68,823
Other comprehensive income (loss):
Foreign currency translation gain (loss), net of income tax (expense) benefit of ($31) and $1,369 as of December 31, 2016 and 2015, respectively									1,425	(3,980)	(45)
Comprehensive income (loss)									$ (942,864)	$ (876,522)	$ 68,778