Comprehensive Income (Accumulated Other Comprehensive income (loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				$ (58,526)
Income tax		$ (2,246)	$ (1,043)	(177)	$ (75)
Accumulated other comprehensive income (loss)		(50,900)		(50,900)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				(58,526)	(53,894)
Other comprehensive income (loss) before reclassifications				6,976	967
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]			1,031	866
Income tax				(381)	(320)
Net current-period other comprehensive income (loss)				7,626	1,513
Accumulated other comprehensive income (loss)		(50,900)	(52,381)	(50,900)	(52,381)
Cash Flow Hedging Gain (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				1,546	1,201
Other comprehensive income (loss) before reclassifications				(2,247)	(750)
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	(200)	0	(556)	(524)
Income tax				205	194
Net current-period other comprehensive income (loss)				(2,598)	(1,080)
Accumulated other comprehensive income (loss)		(1,052)	121	(1,052)	121
Pension Liability [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				(26,458)	(25,982)
Other comprehensive income (loss) before reclassifications				0	0
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]	800	700	1,587	1,390
Income tax				(586)	(514)
Net current-period other comprehensive income (loss)				1,001	876
Accumulated other comprehensive income (loss)		(25,457)	(25,106)	(25,457)	(25,106)
Cumulative Translation Adjustment [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				(33,614)	(29,113)
Other comprehensive income (loss) before reclassifications				9,223	1,717
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]			0	0
Income tax				0	0
Net current-period other comprehensive income (loss)				9,223	1,717
Accumulated other comprehensive income (loss)		$ (24,391)	$ (27,396)	$ (24,391)	$ (27,396)

[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. The amounts recorded in the charts above are for the six months ended June 30, 2017 and 2016. For the three months ended June 30, 2017, $0.2 million of the cash flow hedging gain and $0.8 million of the pension liability were reclassified from accumulated other comprehensive loss to the statement of income. For the three months ended June 30, 2016, $0.0 million of the cash flow hedging gain and $0.7 million of the pension liability were reclassified from accumulated other comprehensive loss to the statement of income. Refer to Note 5 and Note 10, respectively, for further details.