Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (3,329)	$ 23,697	$ (211,812)	$ 21,038
Other comprehensive income, net of tax:
Foreign currency translation, net of tax of $1,105, $(1,347), $(1,712) and $(423), respectively	10,099	10	(17,636)	21,378
Net unrealized loss on cash flow hedges, net of tax of $(421), $(80), $(479) and $(24), respectively	(1,271)	(234)	(1,445)	(71)
Net unrealized gain on investment securities, net of tax of $467, $1,100, $900 and $2,064, respectively	1,407	3,213	2,715	6,029
Amortization of pension and postretirement costs, net of tax benefits of $3,502, $2,124, $6,152 and $4,773, respectively	11,377	7,311	20,247	13,947
Other comprehensive income, net of tax	21,612	10,300	3,881	41,283
Comprehensive income (loss)	$ 18,283	$ 33,997	$ (207,931)	$ 62,321