Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Assets:
Foreign currency forward exchange contracts		$ 16
Liabilities:
Foreign currency forward exchange contracts		326
Net gain on foreign currency forward exchange contracts	901	2,032
Notional amounts of foreign currency forward exchange contracts	35,063	44,802
Fair Value
Assets:
Foreign currency forward exchange contracts	704
Total Assets	704
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	0
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	704
Total Assets	704
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	0
Level 3
Assets:
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	$ 0