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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 664 | $ 1,601 |
Asset retirement obligations | 2,195 | 1,390 | 1,328
Level 1 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0 | 0 |
Liabilities | 0 | 0 |
Level 2 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 664 | 1,601 |
Liabilities | 10,442 | 0 |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset retirement obligations | 2,195 |  |
Level 3 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0 | 0 |
Liabilities | 0 | 0 |
Diamondback Energy LLC [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 151,317 |  |
Diamondback Energy LLC [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 0 |  |
Diamondback Energy LLC [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | $ 0 |  |

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