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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 324 | $ 664 |
Asset retirement obligation capitalized | 3,556 | 2,195 | 1,390
Level 1 [Member] | Diamondback Energy LLC [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 178,708 | 151,317 |
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] | Diamondback Energy LLC [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment in Diamondback | 0 | 0 |
Level 2 [Member] | Fixed Price Swaps [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 845 | 664 |
Liabilities | 23,646 | 10,442 |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset retirement obligation capitalized | 3,600 |  |
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 | 0 |
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 |

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