Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net earnings	$ 155,510	$ 136,323	$ 460,097	$ 372,590
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	(60,755)	31,902	(53,763)	(10,219)
Total other comprehensive income/(loss), net of tax	(60,755)	31,902	(53,763)	(10,219)
Comprehensive income	$ 94,755	$ 168,225	$ 406,334	$ 362,371