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Contingencies (Details) (USD $)
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12 Months Ended | 0 Months Ended | 36 Months Ended | 1 Months Ended | 0 Months Ended | 4 Months Ended | 0 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2012
Shell Trading Company [Member]
Oil [Member]
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Dec. 31, 2011
Shell Trading Company [Member]
Oil [Member]
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Dec. 31, 2010
Shell Trading Company [Member]
Oil [Member]
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Dec. 31, 2012
Diamondback [Member]
Oil [Member]
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Dec. 31, 2011
Diamondback [Member]
Oil [Member]
|
Dec. 31, 2010
Diamondback [Member]
Oil [Member]
|
Dec. 31, 2012
Diamondback [Member]
Natural Gas Liquids [Member]
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Dec. 31, 2011
Diamondback [Member]
Natural Gas Liquids [Member]
|
Dec. 31, 2011
Diamondback [Member]
Natural Gas [Member]
|
Dec. 31, 2010
Diamondback [Member]
Natural Gas [Member]
|
Dec. 31, 2012
North American Gas [Member]
Natural Gas [Member]
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Dec. 31, 2012
Hess [Member]
Natural Gas [Member]
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Dec. 31, 2012
Chevron [Member]
Natural Gas [Member]
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Dec. 31, 2011
Chevron [Member]
Natural Gas [Member]
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Dec. 31, 2010
Chevron [Member]
Natural Gas [Member]
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Dec. 31, 2011
Hilcorp Energy Company [Member]
Natural Gas [Member]
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Dec. 31, 2010
Hilcorp Energy Company [Member]
Natural Gas [Member]
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Dec. 31, 2012
Maximum [Member]
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Apr. 20, 2009
Louisiana Department of Revenue Tax Litigation [Member]
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Dec. 31, 2007
Louisiana Department of Revenue Tax Litigation [Member]
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Dec. 31, 2010
Louisiana Department of Revenue Tax Litigation [Member]
lawsuit
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Nov. 30, 2006
Cudd Pressure Control Litigation [Member]
defendant
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Nov. 03, 2008
Cudd Pressure Control Litigation [Member]
Royalty Fee [Member]
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Nov. 03, 2008
Cudd Pressure Control Litigation [Member]
Minimum [Member]
Attorney Fees [Member]
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Dec. 09, 2010
Reed Litigation [Member]
plaintiff
defendant
acre
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Jul. 31, 2010
Reed Litigation [Member]
defendant
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Dec. 07, 2010
Reed Litigation [Member]
defendant
acre
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Dec. 06, 2010
Reed Litigation [Member]
acre
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Jul. 31, 2010
Reed Litigation [Member]
Individual Counterparty [Member]
plaintiff
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Jul. 31, 2010
Reed Litigation [Member]
Limited Liability Company [Member]
plaintiff
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| Loss Contingencies [Line Items] | |||||||||||||||||||||||||||||||
| Alleged severance tax | $ 1,800,000 | ||||||||||||||||||||||||||||||
| Lawsuits filed value | 2,275,729 | 11,800,000 | 450,000 | ||||||||||||||||||||||||||||
| Number of pending claims | 2 | ||||||||||||||||||||||||||||||
| Number of defendants | 6 | 6 | 15 | 21 | |||||||||||||||||||||||||||
| Damages sought as a percentage of final judgement | 10.00% | ||||||||||||||||||||||||||||||
| Number of plaintiffs | 4 | 6 | 1 | ||||||||||||||||||||||||||||
| Original number of acreage in litigation | 240 | ||||||||||||||||||||||||||||||
| Amended number of acreage in litigation | 1,700 | ||||||||||||||||||||||||||||||
| FDIC insured amount | 250,000 | ||||||||||||||||||||||||||||||
| Uninsured cash amount | $ 166,588,000 | ||||||||||||||||||||||||||||||
| Percentage of production sold | 92.00% | 93.00% | 75.00% | 8.00% | 7.00% | 19.00% | 91.00% | 100.00% | 22.00% | 50.00% | 41.00% | 18.00% | 16.00% | 27.00% | 32.00% | 50.00% | 10.00% | ||||||||||||||