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Fair Value Measurements (Details) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets/(Liabilities) at Fair Value
   
Fair Value Measurements at Reporting Date    
Derivative assets $ 2,727 $ 2,510
Derivative liabilities (4,036) (4,688)
Quoted Prices in Active Markets for Identical Assets/(Liabilities) (Level 1)
   
Fair Value Measurements at Reporting Date    
Derivative assets 939 543
Derivative liabilities (4,036) (4,688)
Significant Other Observable Inputs (Level 2)
   
Fair Value Measurements at Reporting Date    
Derivative assets $ 1,788 $ 1,967