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Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Center | Sep. 30, 2012 | Dec. 31, 2012
Oil & Gas properties [Abstract] |  |  |  |  |
Unproved | $ 9,687,000 |  | $ 9,687,000 |  | $ 9,169,000
Wells in progress | 777,000 |  | 777,000 |  | 0
Proved | 127,382,000 |  | 127,382,000 |  | 119,919,000
Oil & Gas properties | 137,846,000 |  | 137,846,000 |  | 129,088,000
Less accumulated depreciation depletion and amortization | (53,333,000) |  | (53,333,000) |  | (43,454,000)
Net book value | 84,513,000 |  | 84,513,000 |  | 85,634,000
Mineral properties | 20,739,000 |  | 20,739,000 |  | 20,739,000
Building, land and equipment | 8,410,000 |  | 8,410,000 |  | 8,469,000
Less accumulated depreciation | (4,184,000) |  | (4,184,000) |  | (4,034,000)
Net book value | 4,226,000 |  | 4,226,000 |  | 4,435,000
Net properties and equipment | 109,478,000 |  | 109,478,000 |  | 110,808,000
Oil and Gas Properties [Abstract] |  |  |  |  |
Capitalized costs excluded from amortized cost pool | 10,500,000 |  | 10,500,000 |  | 9,200,000
Capitalized costs related to unevaluated properties included in the amortization base | 0 |  | 0 |  | 0
Period after which costs will be added to the full cost amortization pool for properties |  |  | 2 years |  |
Percentage of discount used for future net revenue (in hundredths) |  |  | 10.00% |  |
Period for calculating unescalated average prices prior to the end of reporting period |  |  | 12 months |  |
Number of cost centers for quarterly ceiling test for oil and gas |  |  | 1 |  |
Price per barrel for oil at ceiling test (in dollars per barrel) | 95.04 |  |  |  |
Price for natural gas at ceiling test (dollars per MMbtu) | 3.612 |  |  |  |
Proved property impairments | 0 | 0 | 5,828,000 | 523,000 |
Mineral Properties [Abstract] |  |  |  |  |
Costs associated with Mount Emmons beginning of year |  |  | 20,739,000 | 20,739,000 | 20,739,000
Development costs |  |  | 0 |  | 0
Costs at the end of the period | $ 20,739,000 |  | $ 20,739,000 |  | $ 20,739,000
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful lives |  |  | 45 years |  |

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