Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 531,451	$ 521,759	$ 692,164
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(25,010)	46,280	(9,288)
Derivative financial instruments	20,009	(29,778)	6,638
Marketable securities	0	1,194	(100)
Pension and postretirement benefit plans	(16,286)	47,636	52,574
Total other comprehensive (loss) income, net of tax	(21,287)	65,332	49,824
Comprehensive income	$ 510,164	$ 587,091	$ 741,988