CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 44,758	$ 50,158	$ 74,652	$ 101,794
Other comprehensive loss, net of tax:
Cash flow hedges	(495)	1,527	(721)	1,527
Foreign currency translation adjustments	(6,895)	(4,529)	(8,807)	(17,027)
Total other comprehensive loss	(7,390)	(3,002)	(9,528)	(15,500)
Comprehensive income	$ 37,368	$ 47,156	$ 65,124	$ 86,294