Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net earnings	$ 160,417	$ 155,510	$ 487,470	$ 460,097
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	(49,684)	(60,755)	(104,482)	(53,763)
Post retirement benefit plan adjustment	0	0	1,063	0
Total other comprehensive income/(loss), net of tax	(49,684)	(60,755)	(105,545)	(53,763)
Comprehensive income	$ 110,733	$ 94,755	$ 381,925	$ 406,334