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Property Disclosures and Operating Leases (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
Horizontal Drilling Rig [Member]
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Sep. 30, 2013
Horizontal Drilling Rig [Member]
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Dec. 31, 2012
Horizontal Drilling Rig [Member]
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Sep. 30, 2013
Horizontal Drilling Rig [Member]
Early Termination Provision if Sub Lessor is Found [Member]
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Apr. 30, 2012
Horizontal Drilling Rig One [Member]
Permian Basin [Member]
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Aug. 01, 2013
Horizontal Drilling Rig Two [Member]
Permian Basin [Member]
Subsequent Event [Member]
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Nov. 05, 2013
Medusa Fields, Medusa Spar LLC, And Gulf Of Mexico Shelf Properties [Member]
Subsequent Event [Member]
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Oct. 17, 2013
Medusa Fields, Medusa Spar LLC, And Gulf Of Mexico Shelf Properties [Member]
Subsequent Event [Member]
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Oct. 17, 2013
Medusa Field [Member]
Subsequent Event [Member]
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Oct. 17, 2013
Medusa Spar, LLC [Member]
Subsequent Event [Member]
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Sep. 30, 2013
Swan Lake Field [Member]
Subsequent Event [Member]
Mcfe
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Oct. 31, 2013
Swan Lake Field [Member]
Subsequent Event [Member]
acre
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Jun. 01, 2013
Southern Reagan County, Texas [Member]
Oil_well
acre
bbl
|
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| Property | |||||||||||||||
| Contracted drilling rig, term (in years) | 2 years | 1 year | |||||||||||||
| Operating lease payments | $ 3,874 | $ 8,425 | |||||||||||||
| Business Acquisitions | |||||||||||||||
| Gross acres acquired | 2,468 | ||||||||||||||
| Net acres acquired | 429 | 2,186 | |||||||||||||
| Gross number of oil wells acquired | 7 | ||||||||||||||
| Number of barrels of oil equivalent proved reserves acquired | 1,051,000 | ||||||||||||||
| Purchase price | 11,000 | 0 | 11,000 | ||||||||||||
| Operating Leases, Future Minimum Payments Due | |||||||||||||||
| Lease payments in 2013 | 12,601 | 2,760 | |||||||||||||
| Lease payments in 2013 in remainder of fiscal year | 4,176 | 4,176 | |||||||||||||
| Lease payments in 2014 | 6,941 | 6,941 | 4,530 | ||||||||||||
| Discontinued Operations and Disposal Groups [Abstract] | |||||||||||||||
| Percentage of business sold | 15.00% | 10.00% | 69.00% | ||||||||||||
| Net cash consideration received from sale of businesses | 100,000 | 2,000 | |||||||||||||
| Proceeds received from sale of businesses | 76,400 | ||||||||||||||
| Deposit paid by purchaser of business | 2,000 | ||||||||||||||
| Potential adjustment in proceeds | $ 11,500 | ||||||||||||||
| Net acres disposed | 429 | 2,186 | |||||||||||||
| Approximate production per day during period | 173 | ||||||||||||||