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Fair Value Measurements (Details) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets/(Liabilities) at Fair Value
   
Fair Value Measurements at Reporting Date    
Derivative assets $ 9,192 $ 2,510
Derivative liabilities (3,066) (4,688)
Quoted Prices in Active Markets for Identical Liabilities (Level 1)
   
Fair Value Measurements at Reporting Date    
Derivative assets 521 543
Derivative liabilities (3,066) (4,688)
Significant Other Observable Inputs (Level 2)
   
Fair Value Measurements at Reporting Date    
Derivative assets $ 8,671 $ 1,967