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Risk Management and Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value $ 10,522 $ 0
Derivative Liabilities, Fair Value 455 3,435
Foreign exchange contracts
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 10,522 0
Derivative Liabilities, Fair Value 0 2,855
Cash flow interest rate swap
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 0 0
Derivative Liabilities, Fair Value $ 455 $ 580