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Foreign Currency Exposures and Derivative Instruments (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Not Designated [Member]
Other Current Assets [Member]
Dec. 31, 2010
Not Designated [Member]
Other Current Assets [Member]
Jun. 30, 2011
Not Designated [Member]
Accrued Expenses [Member]
Dec. 31, 2010
Not Designated [Member]
Accrued Expenses [Member]
Fair value of the Company's derivative assets and liabilities on its consolidated and condensed balance sheets                
Derivative Assets (Reported in Other Current Assets)         $ 45 $ 133    
Derivative Liabilities (Reported in Accrued Expenses)             (131) 0
Effect of net realized and unrealized gains and losses relating to the Company's foreign exchange option contracts, on its results of operations                
(Loss) gain on foreign exchange option contracts not designated $ (102) $ 18 $ (371) $ (592)