Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 96,422	$ 128,757	$ 180,018
Foreign currency translation adjustments	(4,656)	(2,017)	2,775
Total other comprehensive income (loss)	(4,656)	(2,017)	2,775
COMPREHENSIVE INCOME	$ 91,766	$ 126,740	$ 182,793