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Derivative Instruments and Hedging Activities (Derivative Positions) (Details) (Not Designated as Hedging Instrument [Member])
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9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||||||||||
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Sep. 30, 2014
Crude Oil [Member]
MBbls
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Sep. 30, 2014
Crude Oil [Member]
Call Option [Member]
Short [Member]
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Long [Member]
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Short [Member]
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Sep. 30, 2014
Natural Gas [Member]
MMBTU
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Sep. 30, 2014
Natural Gas [Member]
Call Option [Member]
Short [Member]
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Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Long [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Short [Member]
|
Sep. 30, 2014
Crude Oil [Member]
MBbls
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Sep. 30, 2014
Crude Oil [Member]
Call Option [Member]
Short [Member]
|
Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Long [Member]
|
Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Short [Member]
|
Sep. 30, 2014
Natural Gas [Member]
MMBTU
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Sep. 30, 2014
Natural Gas [Member]
Call Option [Member]
Short [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Long [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Short [Member]
|
Sep. 30, 2014
Natural Gas [Member]
MMBTU
|
Sep. 30, 2014
Natural Gas [Member]
Call Option [Member]
Short [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Long [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Short [Member]
|
Sep. 30, 2014
Natural Gas [Member]
MMBTU
|
Sep. 30, 2014
Natural Gas [Member]
Call Option [Member]
Short [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Long [Member]
|
Sep. 30, 2014
Natural Gas [Member]
Put Option [Member]
Short [Member]
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Sep. 30, 2014
Crude Oil [Member]
Swap [Member]
MBbls
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Sep. 30, 2014
Natural Gas [Member]
Swap [Member]
MMBTU
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Sep. 30, 2014
Crude Oil [Member]
Swap [Member]
MBbls
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Sep. 30, 2014
Natural Gas [Member]
Swap [Member]
MMBTU
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Oct. 31, 2014
Natural Gas [Member]
Swap [Member]
Subsequent Event [Member]
MMBTU
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Sep. 30, 2014
Crude Oil [Member]
Swap [Member]
MBbls
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Sep. 30, 2014
Natural Gas [Member]
Swap [Member]
MMBTU
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Oct. 31, 2014
Natural Gas [Member]
Swap [Member]
Subsequent Event [Member]
MMBTU
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Sep. 30, 2014
Crude Oil [Member]
Swap [Member]
MBbls
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Sep. 30, 2014
Natural Gas [Member]
Swap [Member]
MMBTU
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Oct. 31, 2014
Natural Gas [Member]
Swap [Member]
Subsequent Event [Member]
MMBTU
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Sep. 30, 2014
Crude Oil [Member]
Swap [Member]
MBbls
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Sep. 30, 2014
Natural Gas [Member]
Swap [Member]
MMBTU
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Oct. 31, 2014
Natural Gas [Member]
Swap [Member]
Subsequent Event [Member]
MMBTU
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
MBbls
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Long [Member]
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Short [Member]
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
MBbls
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Long [Member]
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Sep. 30, 2014
Crude Oil [Member]
Put Option [Member]
Short [Member]
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Sep. 30, 2014
Swap Contracts Combined With Short Put Three Months December 31, 2014 [Member]
Crude Oil [Member]
MBbls
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Sep. 30, 2014
Swap Contracts Combined With Short Put Three Months December 31, 2014 [Member]
Crude Oil [Member]
Put Option [Member]
Short [Member]
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Sep. 30, 2014
Swap Contracts Combined With Short Put Three Months December 31, 2014 [Member]
Crude Oil [Member]
Swap [Member]
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Sep. 30, 2014
Swap Contracts Combined With Short Calls Three Months December 31, 2014 [Member]
Natural Gas [Member]
Short [Member]
MMBTU
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Sep. 30, 2014
Swap Contracts Combined With Short Calls Three Months December 31, 2014 [Member]
Natural Gas [Member]
Swap [Member]
Short [Member]
|
Sep. 30, 2014
Swap Contracts Combined With Short Calls Three Months March 31, 2015 [Member]
Natural Gas [Member]
Call Option [Member]
Short [Member]
MMBTU
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Sep. 30, 2014
Swap Contracts Combined With Short Calls Three Months June 30, 2015 [Member]
Natural Gas [Member]
Call Option [Member]
Short [Member]
MMBTU
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Sep. 30, 2014
Swap Contracts Combined With Short Calls Three Months September 30, 2015 [Member]
Natural Gas [Member]
Call Option [Member]
Short [Member]
MMBTU
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Sep. 30, 2014
Swap Contracts Combined With Short Calls Three Months December 31, 2015 [Member]
Natural Gas [Member]
Call Option [Member]
Short [Member]
MMBTU
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Sep. 30, 2014
Call Contracts Three Months December 31, 2014 [Member]
Natural Gas [Member]
Call Option [Member]
MMBTU
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Sep. 30, 2014
Call Contracts Three Months December 31, 2014 [Member]
Natural Gas [Member]
Call Option [Member]
Long [Member]
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Sep. 30, 2014
Call Contracts Three Months December 31, 2014 [Member]
Natural Gas [Member]
Call Option [Member]
Short [Member]
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| Derivative [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total volume, oil contracts | 158 | 159 | 267 | 171 | 136 | 129 | 74 | 138 | 138 | 92 | ||||||||||||||||||||||||||||||||||||||||||||||
| Total volume, natural gas contracts | 248,000 | 227,000 | 207,000 | 161,000 | 414,000 | 248,000 | 23,000,000 | 227,000 | 10,000,000 | 207,000 | 12,000,000 | 161,000 | 67,000,000 | 184,000 | 108,000,000 | 109,000,000 | 110,000,000 | 111,000,000 | 115,000 | |||||||||||||||||||||||||||||||||||||
| Strike price | 99.10 | 90.00 | 75.00 | 4.67 | 4.00 | 3.50 | 99.10 | 90.00 | 75.00 | 4.32 | 3.85 | 3.25 | 4.32 | 3.85 | 3.25 | 4.32 | 3.85 | 3.25 | 90.00 | 75.00 | 90.00 | 75.00 | 70.00 | 5.00 | 5.00 | 5.00 | 5.00 | 4.75 | 4.75 | |||||||||||||||||||||||||||
| Average swap price | 93.66 | 4.04 | 92.25 | 3.98 | 3.91 | 92.18 | 3.98 | 3.91 | 92.25 | 3.98 | 3.91 | 92.20 | 3.98 | 3.91 | ||||||||||||||||||||||||||||||||||||||||||
| Swap price | 93.35 | 4.25 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||