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Contingencies (Details) (USD $)
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0 Months Ended | 1 Months Ended | 36 Months Ended | 48 Months Ended | 0 Months Ended | 4 Months Ended | 12 Months Ended | 0 Months Ended | |||||||||||||||||||||
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Dec. 31, 2013
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Apr. 20, 2009
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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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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Dec. 09, 2010
Reed Litigation [Member]
defendant
plaintiff
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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Dec. 31, 2013
Maximum [Member]
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Dec. 31, 2013
Shell Trading Company [Member]
Oil [Member]
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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, 2013
Markwest Utica [Member]
Natural Gas Liquids [Member]
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Dec. 31, 2013
Sequent [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2012
Diamondback [Member]
Oil [Member]
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Dec. 31, 2011
Diamondback [Member]
Oil [Member]
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Dec. 31, 2012
Diamondback [Member]
Natural Gas Liquids [Member]
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Dec. 31, 2011
Diamondback [Member]
Natural Gas Liquids [Member]
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Dec. 31, 2011
Diamondback [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2011
Hilcorp Energy Company [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2012
North American Gas [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2013
Hess [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2012
Hess [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2013
Interstate Gas [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2012
Chevron [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Dec. 31, 2011
Chevron [Member]
Natural Gas, Per Thousand Cubic Feet [Member]
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Jul. 31, 2010
Individual Counterparty [Member]
Reed Litigation [Member]
plaintiff
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Jul. 31, 2010
Limited Liability Company [Member]
Reed Litigation [Member]
plaintiff
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| Loss Contingencies [Line Items] | |||||||||||||||||||||||||||||
| Loss Contingency, Number of Plaintiffs | 4 | 6 | 1 | ||||||||||||||||||||||||||
| Loss Contingency, Number of Defendants | 6 | 15 | 21 | ||||||||||||||||||||||||||
| Cash, FDIC Insured Amount | $ 250,000 | ||||||||||||||||||||||||||||
| Alleged Severance Taxes Underpayment | 1,800,000 | 12,000,000 | |||||||||||||||||||||||||||
| Cash, Uninsured Amount | 457,700,000 | ||||||||||||||||||||||||||||
| Percentage Of Production Sold | 99.00% | 92.00% | 93.00% | 100.00% | 32.00% | 8.00% | 7.00% | 91.00% | 100.00% | 22.00% | 50.00% | 41.00% | 31.00% | 18.00% | 17.00% | 16.00% | 27.00% | ||||||||||||
| Original Number Of Acreage In Litigation | 240 | ||||||||||||||||||||||||||||
| Amended Number Of Acreage In Litigation | 1,700 | ||||||||||||||||||||||||||||
| Loss Contingency, Damages Sought, Value | $ 2,300,000 | $ 4,400,000 | |||||||||||||||||||||||||||
| Loss Contingency, Pending Claims, Number | 2 | 2 | |||||||||||||||||||||||||||