Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (12,395)	$ 58,975	$ 182,780
Other comprehensive income (loss), net of tax:
Foreign currency translation	(2)	(17)	(231)
Net gain/(loss) arising during the period			(344)
Amortization of prior service cost	0	0	(344)
Total other comprehensive income, net of tax	(2)	(17)	(575)
Comprehensive income (loss)	$ (12,397)	$ 58,958	$ 182,205