Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 131,521	$ 140,357	$ 257,748	$ 267,963
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments (net of tax of $0 in 2016 and 2015)	(1,555)	3,789	12,161	(15,661)
Comprehensive income	$ 129,966	$ 144,146	$ 269,909	$ 252,302