Comprehensive Income (Loss) (Accumulated Other Comprehensive income (loss)) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)		$ (49,078)
Accumulated other comprehensive income (loss)		(46,333)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)		(49,078)	$ (58,526)
Other comprehensive income (loss) before reclassifications		1,278	3,330
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	1,934	462
Reclassification from AOCI, Current Period, Tax		(467)	(171)
Net current-period other comprehensive income (loss)		2,745	3,621
Accumulated other comprehensive income (loss)		(46,333)	(54,905)
Cash Flow Hedging Gain (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)		(3,530)	1,546
Other comprehensive income (loss) before reclassifications		629	(638)
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	1,262	(331)
Reclassification from AOCI, Current Period, Tax		(305)	122
Net current-period other comprehensive income (loss)		1,586	(847)
Accumulated other comprehensive income (loss)		(1,944)	699
Pension Liability [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)		(25,813)	(26,458)
Other comprehensive income (loss) before reclassifications		0	0
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	672	793
Reclassification from AOCI, Current Period, Tax		(162)	(293)
Net current-period other comprehensive income (loss)		510	500
Accumulated other comprehensive income (loss)		(25,303)	(25,958)
Cumulative Translation Adjustment [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)		(19,735)	(33,614)
Other comprehensive income (loss) before reclassifications		649	3,968
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	0	0
Reclassification from AOCI, Current Period, Tax		0	0
Net current-period other comprehensive income (loss)		649	3,968
Accumulated other comprehensive income (loss)		$ (19,086)	$ (29,646)

[1] The cash flow hedging gain (loss) and pension liability accumulated other comprehensive income (loss) components are included in sales or cost of sales and as a component of net periodic pension cost, respectively. Refer to Note 5 and Note 10, respectively, for further details.