Changes in Accumulated Other Comprehensive Income by Component (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Beginning balance	$ 38,556
Other comprehensive income before reclassifications	7,735
Cost of goods sold	(488,669)	(476,108)	(459,060)
Other income (expense)	(4,586)	(7,539)	(4,186)
Net current period other comprehensive income	8,572
Ending balance	47,128	38,556
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Revenues	(33)
Cost of goods sold	790
Other income (expense)	80
Total reclassification out of AOCI	837
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Beginning balance	38,890
Other comprehensive income before reclassifications	9,975
Net current period other comprehensive income	9,975
Ending balance	48,865
Accumulated Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Revenues	0
Cost of goods sold	0
Other income (expense)	0
Total reclassification out of AOCI	0
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Beginning balance	4
Other comprehensive income before reclassifications	(15)
Net current period other comprehensive income	(15)
Ending balance	(11)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Revenues	0
Cost of goods sold	0
Other income (expense)	0
Total reclassification out of AOCI	0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Beginning balance	(819)
Other comprehensive income before reclassifications	267
Net current period other comprehensive income	267
Ending balance	(552)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Revenues	0
Cost of goods sold	0
Other income (expense)	0
Total reclassification out of AOCI	0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Beginning balance	481
Other comprehensive income before reclassifications	(2,492)
Net current period other comprehensive income	(1,655)
Ending balance	(1,174)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income, Net of Tax [Roll Forward]
Revenues	(33)
Cost of goods sold	790
Other income (expense)	80
Total reclassification out of AOCI	$ 837