Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ (866,628)	$ 96,422	$ 128,757
Foreign currency translation adjustments	(6,399)	(4,656)	(2,017)
Total other comprehensive income (loss)	(6,399)	(4,656)	(2,017)
COMPREHENSIVE INCOME	$ (873,027)	$ 91,766	$ 126,740