Comprehensive Income Accumulated Other Comprehensive income (loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)	$ (17,572)
Tax expense (benefit)	(7,221)		(3,749)
Accumulated other comprehensive income (loss)	(16,621)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)	(17,572)		(27,581)
Other comprehensive income before reclassifications	756		460
Amounts reclassified from other accumulated comprehensive income before tax	151	[1]	399	[1]
Tax expense (benefit)	44		23
Net current-period other comprehensive income	951		882
Accumulated other comprehensive income (loss)	(16,621)		(26,699)
Cash Flow Hedging Gain (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)	(1,385)	[2]	(1,130)	[2]
Other comprehensive income before reclassifications	800	[2]	2,166	[2]
Amounts reclassified from other accumulated comprehensive income before tax	(119)	[1],[2]	(62)	[1],[2]
Tax expense (benefit)	44	[2]	23	[2]
Net current-period other comprehensive income	725	[2]	2,127	[2]
Accumulated other comprehensive income (loss)	(660)	[2]	997	[2]
Pension Liability [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)	(18,918)	[2]	(30,375)	[2]
Other comprehensive income before reclassifications	0	[2]	0	[2]
Amounts reclassified from other accumulated comprehensive income before tax	270	[1],[2]	461	[1],[2]
Tax expense (benefit)	0	[2]	0	[2]
Net current-period other comprehensive income	270	[2]	461	[2]
Accumulated other comprehensive income (loss)	(18,648)	[2]	(29,914)	[2]
Cumulative Translation Adjustment [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss)	2,731		3,924
Other comprehensive income before reclassifications	(44)		(1,706)
Amounts reclassified from other accumulated comprehensive income before tax	0	[1]	0	[1]
Tax expense (benefit)	0		0
Net current-period other comprehensive income	(44)		(1,706)
Accumulated other comprehensive income (loss)	$ 2,687		$ 2,218

[1] The cash flow hedging gain (loss) and pension liability accumulated other comprehensive income components are included in sales or cost of sales and as a component of net periodic pension income, respectively. Refer to Note 4 and Note 9, respectively, for further details.

[2] All amounts are net of tax.