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Equity Investment (Diamondback Income Statement Disclosure) (Details) (Diamondback Energy LLC [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Diamondback Energy LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gross revenue | $ 57,791 | $ 16,814 | $ 132,094 | $ 49,195
Income from operations | 29,423 | 4,086 | 57,468 | 15,130
Net income | $ 14,596 | $ 452 | $ 34,463 | $ 15,553

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