Accumulated Other Comprehensive Income (Loss) (Schedule of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		$ (125,197)	$ (120,232)
Other comprehensive income (loss)		1,142	(485)
Currency impact		(480)	103
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	1,502	1,331
Amortization of prior service cost (1)	[1]	(38)	47
Cost of sales		(67)	540
Interest expense		585	391
Current-period other comprehensive income (loss)		2,644	1,927
Tax effect		(615)	409
Ending balance		(123,168)	(117,896)
Foreign Currency Translation [Member]
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(27,828)	(22,913)
Other comprehensive income (loss)		1,408	3,350
Amounts reclassified from accumulated other comprehensive income (loss):
Current-period other comprehensive income (loss)		1,408	3,350
Tax effect		0	(145)
Ending balance		(26,420)	(19,708)
Derivative Instruments [Member]
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(515)	(1,860)
Other comprehensive income (loss)		(266)	(3,835)
Amounts reclassified from accumulated other comprehensive income (loss):
Cost of sales		(67)	540
Interest expense		585	391
Current-period other comprehensive income (loss)		252	(2,904)
Tax effect		(87)	1,046
Ending balance		(350)	(3,718)
Pension and Other Postretirement Benefits [Member]
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(96,854)	(95,459)
Other comprehensive income (loss)		0	0
Currency impact		(480)	103
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	1,502	1,331
Amortization of prior service cost (1)	[1]	(38)	47
Current-period other comprehensive income (loss)		984	1,481
Tax effect		(528)	(492)
Ending balance		$ (96,398)	$ (94,470)

[1] (1) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost within the cost of sales and selling, general and administrative expenses on the Condensed Consolidated Statements of Operations.