Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets:
Foreign currency forward exchange contracts		$ 1,015
Liabilities:
Foreign currency forward exchange contracts		102
Gain (Loss) on forward exchange contracts	1,026	(1,444)	1,216
Notional Amount of Foreign Currency Derivatives	42,475	45,524
Fair Value
Assets:
Foreign currency forward exchange contracts	388
Total Assets	388
Liabilities:
Foreign currency forward exchange contracts	404
Total Liabilities	404
Level 1
Assets:
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	0
Level 2
Assets:
Foreign currency forward exchange contracts	388
Total Assets	388
Liabilities:
Foreign currency forward exchange contracts	404
Total Liabilities	404
Level 3
Assets:
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	$ 0