Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Liabilities [Abstract]
Net gain (loss) on foreign currency forward exchange contracts	$ 2,032	$ (3,567)
Notional amounts of foreign currency forward exchange contracts	44,802	48,503
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]
Assets [Abstract]
Foreign currency forward exchange contracts	16	26
Total Assets	16	26
Liabilities [Abstract]
Foreign currency forward exchange contracts	326	267
Total Liabilities	326	267
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Assets [Abstract]
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities [Abstract]
Foreign currency forward exchange contracts	0
Total Liabilities	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Assets [Abstract]
Foreign currency forward exchange contracts	16
Total Assets	16
Liabilities [Abstract]
Foreign currency forward exchange contracts	326
Total Liabilities	326
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Assets [Abstract]
Foreign currency forward exchange contracts	0
Total Assets	0
Liabilities [Abstract]
Foreign currency forward exchange contracts	0
Total Liabilities	$ 0