Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Assets:
Foreign currency forward exchange contracts		$ 53
Liabilities:
Foreign currency forward exchange contracts		169
Net gain on foreign currency forward exchange contracts	969	1,059
Notional amounts of foreign currency forward exchange contracts	40,902	39,814
Fair Value
Assets:
Foreign currency forward exchange contracts	18
Total Assets	18
Liabilities:
Foreign currency forward exchange contracts	534
Total Liabilities	534
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	18
Total Assets	18
Liabilities:
Foreign currency forward exchange contracts	534
Total Liabilities	534
Level 3
Assets:
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	$ 0