Comprehensive Income Accumulated Other Comprehensive income (loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				$ (39,822)
Income tax		$ (3,466)	$ (4,114)	(6,648)		$ (11,335)
Accumulated other comprehensive income (loss)		(48,680)		(48,680)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				(39,822)		(17,572)
Other comprehensive income (loss) before reclassifications				(6,699)		1,407
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]			(3,423)		1,406
Income tax				1,264		(520)
Net current-period other comprehensive income (loss)				(8,858)		2,293
Accumulated other comprehensive income (loss)		(48,680)	(15,279)	(48,680)		(15,279)
Cash Flow Hedging Gain (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				3,276		(1,385)
Other comprehensive income (loss) before reclassifications				2,583		(150)
Amounts reclassified from other accumulated comprehensive income (loss) before tax		(2,400)	400	(5,040)	[1]	551	[1]
Income tax				1,862		(204)
Net current-period other comprehensive income (loss)				(595)		197
Accumulated other comprehensive income (loss)		2,681	(1,188)	2,681		(1,188)
Pension Liability [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				(30,760)		(18,918)
Other comprehensive income (loss) before reclassifications				0		0
Amounts reclassified from other accumulated comprehensive income (loss) before tax		800	400	1,617	[1]	855	[1]
Income tax				(598)		(316)
Net current-period other comprehensive income (loss)				1,019		539
Accumulated other comprehensive income (loss)		(29,741)	(18,379)	(29,741)		(18,379)
Cumulative Translation Adjustment [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)				(12,338)		2,731
Other comprehensive income (loss) before reclassifications				(9,282)		1,557
Amounts reclassified from other accumulated comprehensive income (loss) before tax	[1]			0		0
Income tax				0		0
Net current-period other comprehensive income (loss)				(9,282)		1,557
Accumulated other comprehensive income (loss)		$ (21,620)	$ 4,288	$ (21,620)		$ 4,288

[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 (income), respectively. The amounts recorded in the charts above are for the six months ended June 30, 2015 and 2014. For the three months ended June 30, 2015, $2.4 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, 2014, $0.4 million of the cash flow hedging loss and $0.4 million of the pension liability were reclassified from accumulated other comprehensive loss to the statement of income. Refer to Note 4 and Note 9, respectively, for further details.