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Risk Management and Derivatives (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value $ 0 $ 0
Derivative Liabilities, Fair Value 3,435 2,373
Foreign exchange contracts
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 0 0
Derivative Liabilities, Fair Value 2,855 1,342
Cash flow interest rate swap
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 0 0
Derivative Liabilities, Fair Value $ 580 $ 1,031