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Risk Management and Derivatives (Fair value of the derivative financial instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value $ 10,091 $ 0
Derivative Liabilities, Fair Value 8,164 3,435
Foreign exchange contracts
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 690 0
Derivative Liabilities, Fair Value 8,164 2,855
Cash flow interest rate swap
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 368 0
Derivative Liabilities, Fair Value 0 580
Cash flow interest rate cap
   
Derivative financial instruments on consolidated balance sheets    
Derivative Assets, Fair Value 9,033 0
Derivative Liabilities, Fair Value $ 0 $ 0