Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details)

v3.5.0.2
Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details)
MMBTU in Thousands
1 Months Ended 6 Months Ended
Aug. 06, 2016
MMBTU
$ / MMBTU
Jun. 30, 2016
MMBTU
$ / MMBTU
$ / bbl
MBbls
Swap Contracts (WTI) for Remainder of 2016 [Member] | Crude Oil [Member] | Swap [Member]    
Derivative [Line Items]    
Total volume | MBbls   460
Average swap price   58.10
Swap Contracts Combined with Short Puts (WTI, Enhanced Swaps) for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]    
Derivative [Line Items]    
Strike price   30.00
Swap Contracts Combined with Short Puts (WTI, Enhanced Swaps) for Full Year of 2017 [Member] | Crude Oil [Member] | Swap [Member]    
Derivative [Line Items]    
Total volume | MBbls   730
Strike price   44.50
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) For Remainder of 2016 [Member] | Crude Oil [Member]    
Derivative [Line Items]    
Total volume | MBbls   276
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) For Remainder of 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]    
Derivative [Line Items]    
Strike price   63.33
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) For Remainder of 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]    
Derivative [Line Items]    
Strike price   53.33
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) For Remainder of 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]    
Derivative [Line Items]    
Strike price   38.77
Collar Contracts (WTI, Two-Way Collars) for Remainder of 2016 [Member] | Crude Oil [Member]    
Derivative [Line Items]    
Total volume | MBbls   368
Collar Contracts (WTI, Two-Way Collars) for Remainder of 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]    
Derivative [Line Items]    
Strike price   46.50
Collar Contracts (WTI, Two-Way Collars) for Remainder of 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]    
Derivative [Line Items]    
Strike price   37.50
Collar Contracts (WTI, Two-Way Collars) for Full Year of 2017 [Member] | Crude Oil [Member]    
Derivative [Line Items]    
Total volume | MBbls   438
Collar Contracts (WTI, Two-Way Collars) for Full Year of 2017 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]    
Derivative [Line Items]    
Strike price   59.05
Collar Contracts (WTI, Two-Way Collars) for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]    
Derivative [Line Items]    
Strike price   47.50
Collar Contracts Combined with Short Puts (Henry Hub, Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Subsequent Event [Member]    
Derivative [Line Items]    
Total volume | MMBTU 1,460  
Collar Contracts Combined with Short Puts (Henry Hub, Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member] | Subsequent Event [Member]    
Derivative [Line Items]    
Average swap price | $ / MMBTU 3.71  
Collar Contracts Combined with Short Puts (Henry Hub, Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member] | Subsequent Event [Member]    
Derivative [Line Items]    
Average swap price | $ / MMBTU 3.00  
Collar Contracts Combined with Short Puts (Henry Hub, Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Put Option [Member] | Short [Member] | Subsequent Event [Member]    
Derivative [Line Items]    
Average swap price | $ / MMBTU 2.50  
Short Call Option Contracts for Full Year of 2017 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]    
Derivative [Line Items]    
Total volume | MBbls   670
Strike price   50.00
Swap Contracts (Midland Basis Differentials) for Remainder of 2016 [Member] | Crude Oil [Member] | Swap [Member]    
Derivative [Line Items]    
Total volume | MBbls   736
Average swap price   0.17
Swap Contracts (Henry Hub) for Remainder of 2016 [Member] | Natural Gas [Member] | Swap [Member]    
Derivative [Line Items]    
Total volume | MMBTU   1,104
Average swap price | $ / MMBTU   2.52