Pensions and Other Postretirement Benefit Plans (Schedule of (Gains)/Losses Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income:
Settlements/curtailments	$ (51)	$ (103)	$ (8,377)
Asset/liability loss/(gain)	5,498	700	14,707
Amortization of actuarial (loss)	(5,102)	(5,932)	(5,329)
Amortization of prior service (cost)/credit	4,450	$ 4,440	$ 4,436
Pension Plans [Member]
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income:
Settlements/curtailments	(51)
Asset/liability loss/(gain)	6,519
Amortization of actuarial (loss)	(2,283)
Amortization of prior service (cost)/credit	(38)
Amortization of transition (obligation)
Currency impact	(1,655)
Gain in other comprehensive income	2,492
Total cost/(benefit) recognized in net periodic benefit cost and other comprehensive income	6,730
Other Postretirement Benefits [Member]
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income:
Settlements/curtailments
Asset/liability loss/(gain)	(395)
Amortization of actuarial (loss)	(2,819)
Amortization of prior service (cost)/credit	4,488
Amortization of transition (obligation)
Currency impact	(1)
Gain in other comprehensive income	1,273
Total cost/(benefit) recognized in net periodic benefit cost and other comprehensive income	$ 2,301