Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets:
Foreign currency forward exchange contracts		$ 388
Liabilities:
Foreign currency forward exchange contracts		404
Gain (loss) on forward exchange contracts	1,068	1,026	(1,444)
Notional amount of foreign currency derivatives	30,280	42,475
Fair Value
Assets:
Foreign currency forward exchange contracts	16
Total Assets	16
Liabilities:
Foreign currency forward exchange contracts	109
Total Liabilities	109
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	16
Total Assets	16
Liabilities:
Foreign currency forward exchange contracts	109
Total Liabilities	109
Level 3
Assets:
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities:
Foreign currency forward exchange contracts	0
Total Liabilities	$ 0