Quarterly report pursuant to Section 13 or 15(d)

Equity Investment (Diamondback Income Statement Disclosure) (Details)

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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
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