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Income Taxes (Narrative) (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Operating Loss Carryforwards [Line Items] | |||
| Altermative minimum tax credits | $ 1,643,000 | $ 1,000,000 | $ 693,000 |
| Foreign tax credit carryforwards | 2,074,000 | 0 | 0 |
| Valuation allowance for deferred tax assets | 4,629,000 | 12,347,000 | 54,434,000 |
| Change in deferred tax asset valuation | (9,792,000) | (42,087,000) | (18,818,000) |
| Deferred tax expense | 25,633,000 | ||
| Current state and local tax expense (benefit) | 84,000 | 0 | 40,000 |
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Federal [Member]
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| Operating Loss Carryforwards [Line Items] | |||
| Net operating loss carryforward | 4,323,000 | ||
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Oklahoma and Louisiana [Member]
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| Operating Loss Carryforwards [Line Items] | |||
| Net operating loss carryforward | 84,031,000 | ||
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Diamondback [Member]
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| Operating Loss Carryforwards [Line Items] | |||
| Taxable gain on contribution | $ (61,900,000) | ||
| X | ||||||||||
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- Definition
Taxable Gain On Contribution Of Oil And Gas Properties No definition available.
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| X | ||||||||||
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- Definition
The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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