Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (792)	$ 30,252
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	(3,281)	27,578
Total other comprehensive income (loss), Tax	0	0
Other comprehensive income (loss)	(3,281)	27,578
Pension and other postretirement adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	1,700	1,918
Total other comprehensive income (loss), Tax	(438)	(505)
Other comprehensive income (loss)	1,262	1,413
Reclassification adjustments for derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	1,588	1,632
Total other comprehensive income (loss), Tax	(361)	(371)
Other comprehensive income (loss)	1,227	1,261
AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Pre-tax	7	31,128
Total other comprehensive income (loss), Tax	(799)	(876)
Other comprehensive income (loss)	$ (792)	$ 30,252