Derivative Instruments (Details) (Forward foreign exchange contracts included in accrued and other current liabilities [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Forward foreign exchange contracts included in accrued and other current liabilities [Member]
   
Derivative instruments measured at fair value    
Derivative Notional Amount $ 21,237 $ 20,135
Derivative Fair Value $ (560) $ (631)