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
Jun. 30, 2016
Dec. 31, 2015
Derivative Assets    
Derivative Asset $ 5,597 $ 19,943
Derivative Liabilities    
Derivative Liabilities (13,804)  
Total net assets (8,207) 19,943
Level 2 [Member]    
Derivative Assets    
Derivative Asset 5,597 19,943
Derivative Liabilities    
Derivative Liabilities (13,804)  
Total net assets $ (8,207) $ 19,943