Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23,697	$ 51,595	$ 21,038	$ 111,565
Other comprehensive income (loss), net of tax:
Foreign currency translation, net of tax of $(1,347) and $(423) in 2019, respectively	104	(42,942)	21,378	(27,859)
Net unrealized (loss) gain on cash flow hedges, net of tax of $(80), $(78), $(24) and $154, respectively	(234)	(235)	(71)	251
Net unrealized gain (loss) on investment securities, net of tax of $1,100, $(447), $2,064 and $(1,813), respectively	3,213	(1,305)	6,029	(5,296)
Amortization of pension and postretirement costs, net of tax benefits of $2,124, $2,564, $4,773 and $5,368, respectively	7,311	7,868	13,947	16,040
Other comprehensive income (loss), net of tax	10,394	(36,614)	41,283	(16,864)
Comprehensive income	$ 34,091	$ 14,981	$ 62,321	$ 94,701