Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net earnings	$ 696,067	$ 646,033	$ 538,293
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	(139,789)	(115,010)	(15,454)
Unrecognized Pension Gain	(1,063)	0	0
Total other comprehensive income/(loss), net of tax	(140,852)	(115,010)	(15,454)
Comprehensive income	$ 555,215	$ 531,023	$ 522,839