CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (40,907)	$ 3,114	$ (556,798)	$ (107,452)
Pension liability adjustment	(255)	(20)	(760)	(772)
Total other comprehensive loss, net of tax	(255)	(20)	(760)	(772)
Total comprehensive income (loss)	$ (41,162)	$ 3,094	$ (557,558)	$ (108,224)