Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 752,207	$ 844,611	$ 733,993
Other comprehensive (loss) income, net of tax
Foreign currency translation adjustment	(55,362)	(36,808)	(18,009)
Derivative financial instruments	(13,156)	20,722	2,157
Marketable securities	(394)	(424)	(953)
Pension and postretirement benefit plans	(31,350)	(165,757)	291,807
Total other comprehensive (loss) income, net of tax	(100,262)	(182,267)	275,002
Comprehensive income	$ 651,945	$ 662,344	$ 1,008,995