CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 58,633	$ 73,072	$ 105,126	$ 171,482
Other comprehensive income (loss), net of tax:
Cash flow hedges	292	(599)	(573)	(1,009)
Foreign currency translation adjustments	(7,724)	(16,672)	(9,250)	(52,138)
Total other comprehensive loss	(7,432)	(17,271)	(9,823)	(53,147)
Comprehensive income	$ 51,201	$ 55,801	$ 95,303	$ 118,335