Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Derivative Positions) (Details)

v3.2.0.727
Derivative Instruments and Hedging Activities (Derivative Positions) (Details) - Jun. 30, 2015 - Not Designated as Hedging Instrument [Member]
MMBTU in Thousands
MMBTU
$ / bbl
$ / MMBTU
MBbls
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2015 [Member] | Natural Gas [Member]  
Derivative [Line Items]  
Total volume | MMBTU 207
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2015 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price | $ / MMBTU 4.32
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2015 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member]  
Derivative [Line Items]  
Strike price | $ / MMBTU 3.85
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2015 [Member] | Natural Gas [Member] | Put Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price | $ / MMBTU 3.25
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2015 [Member] | Natural Gas [Member]  
Derivative [Line Items]  
Total volume | MMBTU 161
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2015 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price | $ / MMBTU 4.32
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2015 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member]  
Derivative [Line Items]  
Strike price | $ / MMBTU 3.85
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2015 [Member] | Natural Gas [Member] | Put Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price | $ / MMBTU 3.25
Collar Contracts Combined With Short Puts Three Months Ended March 31, 2016 [Member] | Crude Oil [Member]  
Derivative [Line Items]  
Total volume | MBbls 91
Collar Contracts Combined With Short Puts Three Months Ended March 31, 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 70.00
Collar Contracts Combined With Short Puts Three Months Ended March 31, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]  
Derivative [Line Items]  
Strike price 60.00
Collar Contracts Combined With Short Puts Three Months Ended March 31, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 45.00
Collar Contracts Combined With Short Puts Three Months Ended June 30, 2016 [Member] | Crude Oil [Member]  
Derivative [Line Items]  
Total volume | MBbls 91
Collar Contracts Combined With Short Puts Three Months Ended June 30, 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 70.00
Collar Contracts Combined With Short Puts Three Months Ended June 30, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]  
Derivative [Line Items]  
Strike price 60.00
Collar Contracts Combined With Short Puts Three Months Ended June 30, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 45.00
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2016 [Member] | Crude Oil [Member]  
Derivative [Line Items]  
Total volume | MBbls 92
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 70.00
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]  
Derivative [Line Items]  
Strike price 60.00
Collar Contracts Combined With Short Puts Three Months Ended September 30, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 45.00
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2016 [Member] | Crude Oil [Member]  
Derivative [Line Items]  
Total volume | MBbls 92
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 70.00
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]  
Derivative [Line Items]  
Strike price 60.00
Collar Contracts Combined With Short Puts Three Months Ended December 31, 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]  
Derivative [Line Items]  
Strike price 45.00
Swap Contracts Three Months Ended September 30, 2015 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 520
Average swap price 67.22
Swap Contracts Three Months Ended September 30, 2015 [Member] | Natural Gas [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MMBTU 219
Average swap price | $ / MMBTU 3.98
Swap Contracts Three Months Ended December 31, 2015 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 442
Average swap price 64.93
Swap Contracts Three Months Ended December 31, 2015 [Member] | Natural Gas [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MMBTU 228
Average swap price | $ / MMBTU 3.96
Swap Contracts Three Months Ended March 31, 2016 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 91
Average swap price 63.50
Swap Contracts Three Months Ended June 30, 2016 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 91
Average swap price 63.50
Swap Contracts Three Months Ended September 30, 2016 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 92
Average swap price 63.50
Swap Contracts Three Months Ended December 31, 2016 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 92
Average swap price 63.50
Swap Contracts Differentials Three Months Ended September 30, 2015 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 382
Average swap price (2.39)
Swap Contracts Differentials Three Months Ended December 31, 2015 [Member] | Crude Oil [Member] | Swap [Member]  
Derivative [Line Items]  
Total volume | MBbls 327
Average swap price (2.38)
Short Call Contracts Three Months September 30, 2015 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Total volume | MMBTU 110
Strike price | $ / MMBTU 5.00
Short Call Contracts Three Months December 31, 2015 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]  
Derivative [Line Items]  
Total volume | MMBTU 111
Strike price | $ / MMBTU 5.00