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Derivative Instruments (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
bbl / d
$ / bbls
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
bbl / d
$ / bbls
Jun. 30, 2014
USD ($)
Feb. 11, 2015
USD ($)
Dec. 31, 2014
USD ($)
Derivative [Line Items]            
Maximum Length of Time Hedged in Cash Flow Hedge 36 months          
Derivative Asset, Fair Value $ 134,400   $ 134,400     $ 214,800
(Gain) loss on derivatives, net 12,595 $ 39,950 (13,844) $ 60,630    
Value of Offsetting Derivative Transactions 126,400   126,400   $ 166,400  
Gain Recognized on Offsetting Derivative Transaction $ 40,000   40,000      
Value of Offsetting Derivative Transactions Current Asset     106,500      
Value of Offsetting Derivative Transactions Non-Current Asset     19,900      
Unrealized gain on derivatives     $ 8,400      
2015 [Member] | Crude Oil [Member] | Collars [Member]            
Derivative [Line Items]            
Volumes (in Bbls/d) | bbl / d 16,200   16,200      
Weighted Average Floor Price ($/Bbls) | $ / bbls 50.00   50.00      
Weighted Average Ceiling Price ($/Bbls) | $ / bbls 67.34   67.34      
2016 [Member] | Crude Oil [Member] | Collars [Member]            
Derivative [Line Items]            
Volumes (in Bbls/d) | bbl / d 5,490   5,490      
Weighted Average Floor Price ($/Bbls) | $ / bbls 50.96   50.96      
Weighted Average Ceiling Price ($/Bbls) | $ / bbls 74.73   74.73