Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net earnings	$ 658,645	$ 696,067	$ 646,033
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	(111,960)	(139,789)	(115,010)
Unrecognized Pension Gain	0	(1,063)	0
Total other comprehensive income/(loss), net of tax	(111,960)	(140,852)	(115,010)
Comprehensive income	$ 546,685	$ 555,215	$ 531,023