Revenue Recognition (Schedule of Consolidated Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 83,019	$ 32,585	$ 52,812
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	(27,383)	44,162	(23,967)
Pension/postretirement settlements and curtailments	1,494		51
Pension/postretirement plan remeasurement	851	2,955	(5,498)
Amortization of pension liability adjustments:
Prior service credit	(4,454)	(4,453)	(4,450)
Net actuarial loss	(5,175)	(5,439)	(5,102)
Payments related to interest rate swaps included in earnings	(146)	1,490	2,400
Derivative valuation adjustment	3,832	325	1,297
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement settlements and curtailments	(408)	(918)	1,104
Amortization of pension liability adjustments	(158)	(22)	27
Payments related to interest rate swaps included in earnings	37	(566)	(912)
Derivative valuation adjustment	(979)	(124)	(493)
Comprehensive income	60,532	80,873	27,467
Comprehensive income/(loss) attributable to the noncontrolling interest	111	(520)	77
Comprehensive income attributable to the Company	60,421	$ 81,393	$ 27,390
As reported [Member]
Net income	83,019
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	(27,383)
Pension/postretirement settlements and curtailments	1,494
Pension/postretirement plan remeasurement	851
Amortization of pension liability adjustments:
Prior service credit	(4,454)
Net actuarial loss	5,175
Payments related to interest rate swaps included in earnings	(146)
Derivative valuation adjustment	3,832
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement settlements and curtailments	(348)
Pension/postretirement plan remeasurement	(408)
Amortization of pension liability adjustments	(158)
Payments related to interest rate swaps included in earnings	37
Derivative valuation adjustment	(979)
Comprehensive income	60,532
Comprehensive income/(loss) attributable to the noncontrolling interest	111
Comprehensive income attributable to the Company	60,421
Adjustments to reverse effects of ASC 606 [Member]
Net income	(2,448)
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	575
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
Amortization of pension liability adjustments:
Prior service credit
Net actuarial loss
Payments related to interest rate swaps included in earnings
Derivative valuation adjustment
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
Amortization of pension liability adjustments
Payments related to interest rate swaps included in earnings
Derivative valuation adjustment
Comprehensive income	(1,873)
Comprehensive income/(loss) attributable to the noncontrolling interest	(129)
Comprehensive income attributable to the Company	(1,744)
As adjusted to exclude adoption of ASC 606 [Member]
Net income	80,571
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	(26,808)
Pension/postretirement settlements and curtailments	1,494
Pension/postretirement plan remeasurement	851
Amortization of pension liability adjustments:
Prior service credit	(4,454)
Net actuarial loss	5,175
Payments related to interest rate swaps included in earnings	(146)
Derivative valuation adjustment	3,832
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement settlements and curtailments	(348)
Pension/postretirement plan remeasurement	(408)
Amortization of pension liability adjustments	(158)
Payments related to interest rate swaps included in earnings	37
Derivative valuation adjustment	(979)
Comprehensive income	58,659
Comprehensive income/(loss) attributable to the noncontrolling interest	(18)
Comprehensive income attributable to the Company	$ 58,677