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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset retirement obligation capitalized | $ 5,713 | $ 1,771
Level 1 [Member] | Diamondback Energy LLC [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investment in Diamondback | 70,443 |
Level 1 [Member] | Fixed Price Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed price swaps | 0 |
Fixed price swaps and swaptions | 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] |  |
Fixed price swaps | 6,909 |
Fixed price swaps and swaptions | 6,662 |
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Asset retirement obligation capitalized | 5,700 |
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] |  |
Fixed price swaps | 0 |
Fixed price swaps and swaptions | $ 0 |

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