Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net earnings	$ 158,069	$ 171,280	$ 309,485	$ 327,053
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	(46,470)	37,212	(44,727)	(54,798)
Post retirement benefit plan adjustment	0	0	0	(1,063)
Total other comprehensive income/(loss), net of tax	(46,470)	37,212	(44,727)	(55,861)
Comprehensive income	$ 111,599	$ 208,492	$ 264,758	$ 271,192