Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net (loss) earnings	$ (105,195)	$ (953,520)	$ 96,422
Foreign currency translation adjustments	(5,188)	(6,399)	(4,656)
Total other comprehensive loss	(5,188)	(6,399)	(4,656)
Comprehensive (loss) income	$ (110,383)	$ (959,919)	$ 91,766