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Derivative Instruments (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value of Assets    
Gross Amounts of Recognized Assets $ 1,606 $ 1,120
Gross derivative amounts not offset in the balance sheet that are eligible for offsetting    
Derivatives - foreign currency contracts (107) (286)
Net amount 1,499 834
Fair Value of Liabilities    
Gross Amounts of Recognized Liabilities 190 646
Gross derivative amounts not offset in the balance sheet that are eligible for offsetting    
Gross Amounts of Recognized Liabilities (107) (286)
Net amount $ 83 $ 360