Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 692,164	$ 752,207	$ 844,611
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(9,288)	(55,362)	(36,808)
Derivative financial instruments	6,638	(13,156)	20,722
Marketable securities	(100)	(394)	(424)
Pension and postretirement benefit plans	52,574	(31,350)	(165,757)
Total other comprehensive income (loss), net of tax	49,824	(100,262)	(182,267)
Comprehensive income	$ 741,988	$ 651,945	$ 662,344