Revenue Recognition (Schedule of Consolidated Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income		$ 28,484	$ 15,220	$ 69,272	$ 27,427
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(7,847)	11,974	(21,193)	39,348
Pension/postretirement curtailment gain	[1]	(232)		(750)
Amortization of pension liability adjustments:
Prior service credit	[2]	(1,114)	(1,113)	(3,341)	(3,339)
Net actuarial loss	[2]	(1,294)	(1,350)	(3,882)	(4,050)
Payments and amortization related to interest rate swaps included in earnings		(96)	295	138	1,238
Derivative valuation adjustment		1,777	(96)	9,703	(1,094)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment gain		70		225
Amortization of pension liability adjustment		(54)	(71)	(162)	(213)
Payments and amortization related to interest rate swaps included in earnings		23	(112)	(33)	(470)
Derivative valuation adjustment		(427)	36	(2,329)	415
Comprehensive income		21,878	27,483	55,412	67,362
Comprehensive income/(loss) attributable to the noncontrolling interest		264	(43)	446	221
Comprehensive income attributable to the Company		21,614	$ 27,526	54,966	$ 67,141
As reported [Member]
Net income		28,484		69,272
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(7,847)		(21,193)
Pension/postretirement curtailment gain		(232)		(750)
Amortization of pension liability adjustments:
Prior service credit		(1,114)		(3,341)
Net actuarial loss		1,294		3,882
Payments and amortization related to interest rate swaps included in earnings		(96)		138
Derivative valuation adjustment		1,777		9,703
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment gain		70		225
Amortization of pension liability adjustment		(54)		(162)
Payments and amortization related to interest rate swaps included in earnings		23		(33)
Derivative valuation adjustment		(427)		(2,329)
Comprehensive income		21,878		55,412
Comprehensive income/(loss) attributable to the noncontrolling interest		264		446
Comprehensive income attributable to the Company		21,614		54,966
Adjustments to reverse effects of ASC 606 [Member]
Net income		(767)		(3,416)
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		157		688
Pension/postretirement curtailment gain
Amortization of pension liability adjustments:
Prior service credit
Net actuarial loss
Payments and amortization related to interest rate swaps included in earnings
Derivative valuation adjustment
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment gain
Amortization of pension liability adjustment
Payments and amortization related to interest rate swaps included in earnings
Derivative valuation adjustment
Comprehensive income		(610)		(2,728)
Comprehensive income/(loss) attributable to the noncontrolling interest		(27)		(111)
Comprehensive income attributable to the Company		(583)		(2,617)
As adjusted to exclude adoption of ASC 606 [Member]
Net income		27,717		65,856
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(7,690)		(20,505)
Pension/postretirement curtailment gain		(232)		(750)
Amortization of pension liability adjustments:
Prior service credit		(1,114)		(3,341)
Net actuarial loss		1,294		3,882
Payments and amortization related to interest rate swaps included in earnings		(96)		138
Derivative valuation adjustment		1,777		9,703
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment gain		70		225
Amortization of pension liability adjustment		(54)		(162)
Payments and amortization related to interest rate swaps included in earnings		23		(33)
Derivative valuation adjustment		(427)		(2,329)
Comprehensive income		21,268		52,684
Comprehensive income/(loss) attributable to the noncontrolling interest		237		335
Comprehensive income attributable to the Company		$ 21,031		$ 52,349

[1] The curtailment adjustment was included in restructuring expenses, net (see Note 5).

[2] These accumulated other comprehensive income components are included in Other (income)/expense, net (see Note 4).