Derivatives Gain (Loss) in Statement of Finacial Position (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ (5,493,000)	$ 555,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	3,763,000	(250,000)
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	4,000	(7,000)
Amount of Gain (Loss) Recognized in Income on Derivatives	(3,763,000)	(250,000)	(2,803,000)
Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Income	155,000	3,080,000
Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Income		(3,330,000)
Derivative Instruments, Loss Recognized in Income	(3,608,000)
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	545,000	83,000
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(5,547,000)	925,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	3,763,000	(250,000)
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	4,000	(7,000)
Foreign Exchange Forward [Member] | Selling General and Administrative Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Income	545,000	83,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	54,000	(370,000)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	0
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0	0
Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Loss Recognized in Income	$ (600,000)	$ (385,000)