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Derivative Instruments and Hedging Activities (Derivative Positions) (Details) (Not Designated as Hedging Instrument [Member])
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6 Months Ended | |||
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Jun. 30, 2014
MBbls
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Collar Contracts Combined With Short Puts 2015 [Member] | Crude Oil [Member]
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| Derivative [Line Items] | ||||
| Total volume, oil contracts | 317,000 | |||
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Collar Contracts Combined With Short Puts 2015 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Strike price | 99.10 | |||
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Collar Contracts Combined With Short Puts 2015 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Strike price | 75.00 | |||
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Collar Contracts Combined With Short Puts 2015 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
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| Derivative [Line Items] | ||||
| Strike price | 90.00 | |||
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Swap Contracts 2014 [Member] | Crude Oil [Member] | Swap [Member]
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| Derivative [Line Items] | ||||
| Total volume, oil contracts | 304,000 | |||
| Average swap price | 95.10 | |||
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Put Spreads 2015 [Member] | Crude Oil [Member] | Put Option [Member]
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| Derivative [Line Items] | ||||
| Total volume, oil contracts | 276,000 | |||
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Put Spreads 2015 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Strike price | 75.00 | |||
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Put Spreads 2015 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
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| Derivative [Line Items] | ||||
| Strike price | 90.00 | |||
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Swap Contracts Combined With Short Put 2014 [Member] | Crude Oil [Member]
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| Derivative [Line Items] | ||||
| Total volume, oil contracts | 184,000 | |||
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Swap Contracts Combined With Short Put 2014 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Strike price | 70.00 | |||
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Swap Contracts Combined With Short Put 2014 [Member] | Crude Oil [Member] | Swap [Member]
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| Derivative [Line Items] | ||||
| Swap price | 93.35 | |||
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Call Contracts 2014 [Member] | Natural Gas [Member] | Call Option [Member]
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| Derivative [Line Items] | ||||
| Total volume, natural gas contracts | 230,000 | |||
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Call Contracts 2014 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Strike price | 4.75 | [1] | ||
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Call Contracts 2014 [Member] | Natural Gas [Member] | Call Option [Member] | Long [Member]
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| Derivative [Line Items] | ||||
| Strike price | 4.75 | [1] | ||
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Swap Contracts Combined With Short Calls 2014 [Member] | Natural Gas [Member] | Swap [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Total volume, natural gas contracts | 368,000 | |||
| Swap price | 4.25 | |||
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Swap Contracts Combined With Short Calls 2015 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]
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| Derivative [Line Items] | ||||
| Total volume, natural gas contracts | 438,000 | |||
| Strike price | 5.00 | |||
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