Comprehensive Income (Accumulated Other Comprehensive income (loss)) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)		$ (49,078)
Accumulated other comprehensive income (loss)		(47,745)
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		(934)	6,976
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	2,989	1,031
Reclassification from AOCI, Current Period, Tax		(722)	(381)
Net current-period other comprehensive income (loss)		1,333	7,626
Accumulated other comprehensive income (loss)		(47,745)	(50,900)
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		4,165	(2,247)
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	1,645	(556)
Reclassification from AOCI, Current Period, Tax		(397)	205
Net current-period other comprehensive income (loss)		5,413	(2,598)
Accumulated other comprehensive income (loss)		1,883	(1,052)
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]	1,344	1,587
Reclassification from AOCI, Current Period, Tax		(325)	(586)
Net current-period other comprehensive income (loss)		1,019	1,001
Accumulated other comprehensive income (loss)		(24,794)	(25,457)
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		(5,099)	9,223
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)		(5,099)	9,223
Accumulated other comprehensive income (loss)		$ (24,834)	$ (24,391)

[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.