Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 76,953	$ 57,358	$ 178,680	$ 171,392
Other comprehensive income, net of tax:
Foreign currency translation	(2,472)	33,517	(31,545)	100,223
Net unrealized gain on cash flow hedges, net of tax of $174, $122, $474 and $361, respectively	522	195	773	579
Net unrealized (loss) gain on investment securities, net of tax of $(417), $220, $(2,230) and $1,322, respectively	(1,218)	375	(6,514)	2,251
Adjustments to pension and postretirement plans, net of tax of $(304)	0	0	0	(1,482)
Amortization of pension and postretirement costs, net of tax benefits of $2,399, $3,484, $7,766 and $10,440, respectively	8,810	6,744	24,850	20,078
Other comprehensive income (loss), net of tax	5,642	40,831	(12,436)	121,649
Comprehensive income	$ 82,595	$ 98,189	$ 166,244	$ 293,041