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Equity Investments Equity Investment (Diamondback Balance Sheet Disclosure) (Details) (Diamondback Energy LLC [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Diamondback Energy LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 34,516 | $ 50,275
Noncurrent assets | 613,947 | 556,426
Current liabilities | 76,336 | 79,232
Noncurrent liabilities | $ 104,093 | $ 65,401

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