Accumulated Other Comprehensive Income (Loss) (Schedule of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		$ (123,168)	$ (117,896)	$ (125,197)	$ (120,232)
Other comprehensive income (loss)		9,532	(1,436)	10,674	(1,921)
Currency impact		(258)	409	(738)	512
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	1,250	1,228	2,752	2,559
Amortization of prior service cost (1)	[1]	(44)	48	(82)	95
Cost of sales		(90)	515	(157)	1,055
Interest expense		472	620	1,057	1,011
Current-period other comprehensive income (loss)		10,862	1,384	13,506	3,311
Tax effect		(2,842)	(1,068)	(3,457)	(659)
Ending balance		(115,148)	(117,580)	(115,148)	(117,580)
Foreign Currency Translation
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(26,420)	(19,708)	(27,828)	(22,913)
Other comprehensive income (loss)		5,589	(3,298)	6,997	52
Amounts reclassified from accumulated other comprehensive income (loss):
Current-period other comprehensive income (loss)		5,589	(3,298)	6,997	52
Tax effect		0	419	0	274
Ending balance		(20,831)	(22,587)	(20,831)	(22,587)
Derivative Instruments
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(350)	(3,718)	(515)	(1,860)
Other comprehensive income (loss)		(858)	(893)	(1,124)	(4,728)
Amounts reclassified from accumulated other comprehensive income (loss):
Cost of sales		(90)	515	(157)	1,055
Interest expense		472	620	1,057	1,011
Current-period other comprehensive income (loss)		(476)	242	(224)	(2,662)
Tax effect		(87)	(85)	(174)	961
Ending balance		(913)	(3,561)	(913)	(3,561)
Pension and Other Postretirement Benefits
Change in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance		(96,398)	(94,470)	(96,854)	(95,459)
Other comprehensive income (loss)		4,801	2,755	4,801	2,755
Currency impact		(258)	409	(738)	512
Amounts reclassified from accumulated other comprehensive income (loss):
Amortization of actuarial loss (1)	[1]	1,250	1,228	2,752	2,559
Amortization of prior service cost (1)	[1]	(44)	48	(82)	95
Current-period other comprehensive income (loss)		5,749	4,440	6,733	5,921
Tax effect		(2,755)	(1,402)	(3,283)	(1,894)
Ending balance		$ (93,404)	$ (91,432)	$ (93,404)	$ (91,432)

[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.