CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 50,500	$ 44,758	$ 98,410	$ 74,652
Other comprehensive income (loss), net of tax:
Cash flow hedges	194	(495)	(410)	(721)
Foreign currency translation adjustments	30,499	(6,895)	(35,465)	(8,807)
Total other comprehensive income (loss)	30,693	(7,390)	(35,875)	(9,528)
Comprehensive income	$ 81,193	$ 37,368	$ 62,535	$ 65,124