Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details)

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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative Assets    
Derivative Asset $ 15,585 $ 19,943
Derivative Liabilities    
Derivative Liabilities (4,290)  
Total net assets 11,295 19,943
Level 2 [Member]    
Derivative Assets    
Derivative Asset 15,585 19,943
Derivative Liabilities    
Derivative Liabilities (4,290)  
Total net assets $ 11,295 $ 19,943