Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ 5,108	$ (60,090)	$ 4,316	$ (29,838)
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	2,628	(62,645)	(653)	(35,067)
Total other comprehensive income (loss), Tax	0	0	0	0
Other comprehensive income (loss)		(62,645)	(653)	(35,067)
Pension and other postretirement adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	1,691	1,753	3,391	3,671
Total other comprehensive income (loss), Tax	(435)	(457)	(873)	(962)
Other comprehensive income (loss)		1,296	2,518	2,709
Reclassification adjustments for derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	1,583	1,627	3,171	3,259
Total other comprehensive income (loss), Tax	(359)	(368)	(720)	(739)
Other comprehensive income (loss)	1,224	1,259	2,451	2,520
AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	5,902	(59,265)	5,909	(28,137)
Total other comprehensive income (loss), Tax	(794)	(825)	(1,593)	(1,701)
Other comprehensive income (loss)	$ 5,108	$ (60,090)	$ 4,316	$ (29,838)