Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net earnings	$ 167,079	$ 160,417	$ 476,564	$ 487,470
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	9,054	(49,684)	(35,673)	(104,482)
Post retirement benefit plan adjustment	0	0	0	(1,063)
Total other comprehensive income/(loss), net of tax	9,054	(49,684)	(35,673)	(105,545)
Comprehensive income	$ 176,133	$ 110,733	$ 440,891	$ 381,925