Revenue Recognition (Schedule of Consolidated Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income		$ 30,306	$ 1,233	$ 40,788	$ 12,207
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(30,851)	17,436	(13,346)	27,374
Pension/postretirement curtailment		(518)		(518)
Amortization of pension liability adjustments:
Prior service credit	[1]	(1,113)	(1,113)	(2,227)	(2,226)
Net actuarial loss	[1]	(1,291)	(1,353)	(2,588)	(2,700)
Payments and amortization related to interest rate swaps included in earnings		54	343	234	943
Derivative valuation adjustment		2,211	(1,414)	7,926	(998)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment		155		155
Amortization of pension liability adjustment		(53)	(72)	(108)	(142)
Payments related to interest rate swaps included in earnings		(13)	(130)	(56)	(358)
Derivative valuation adjustment		(530)	537	(1,902)	379
Comprehensive income		939	18,173	33,534	39,879
Comprehensive income attributable to the noncontrolling interest		(48)	124	182	264
Comprehensive income attributable to the Company		987	$ 18,049	33,352	$ 39,615
As reported [Member]
Net income		30,306		40,788
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(30,851)		(13,346)
Pension/postretirement curtailment		(518)		(518)
Amortization of pension liability adjustments:
Prior service credit		(1,113)		(2,227)
Net actuarial loss		1,291		2,588
Payments and amortization related to interest rate swaps included in earnings		54		234
Derivative valuation adjustment		2,211		7,926
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment		155		155
Amortization of pension liability adjustment		(53)		(108)
Payments related to interest rate swaps included in earnings		(13)		(56)
Derivative valuation adjustment		(530)		(1,902)
Comprehensive income		939		33,534
Comprehensive income attributable to the noncontrolling interest		(48)		182
Comprehensive income attributable to the Company		987		33,352
Adjustments to reverse effects of ASC 606 [Member]
Net income		(1,402)		(2,649)
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		839		531
Pension/postretirement curtailment
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
Amortization of pension liability adjustment
Payments related to interest rate swaps included in earnings
Derivative valuation adjustment
Comprehensive income		(563)		(2,118)
Comprehensive income attributable to the noncontrolling interest		(27)		(84)
Comprehensive income attributable to the Company		(536)		(2,034)
As adjusted to exclude adoption of ASC 606 [Member]
Net income		28,904		38,139
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(30,012)		(12,815)
Pension/postretirement curtailment		(518)		(518)
Amortization of pension liability adjustments:
Prior service credit		(1,113)		(2,227)
Net actuarial loss		1,291		2,588
Payments and amortization related to interest rate swaps included in earnings		54		234
Derivative valuation adjustment		2,211		7,926
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment		155		155
Amortization of pension liability adjustment		(53)		(108)
Payments related to interest rate swaps included in earnings		(13)		(56)
Derivative valuation adjustment		(530)		(1,902)
Comprehensive income		376		31,416
Comprehensive income attributable to the noncontrolling interest		(75)		98
Comprehensive income attributable to the Company		$ 451		$ 31,318

[1] These accumulated other comprehensive income components are included in Other expense, net (see Note 4). The curtailment adjustment was included in restructuring expenses, net.