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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 863 |  | $ 664
Asset retirement obligation capitalized | 1,194 | 1,176 |
Level 1 [Member] | Diamondback Energy LLC [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 198,662 |  |
Level 1 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 2 [Member] | Diamondback Energy LLC [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 0 |  |
Level 2 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 863 |  |
Liabilities | 1,839 |  |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset retirement obligation capitalized | 1,200 |  |
Level 3 [Member] | Diamondback Energy LLC [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 0 |  |
Level 3 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0 |  |
Liabilities | $ 0 |  |

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