Quarterly report pursuant to Section 13 or 15(d)

Equity Investments Equity Investment (Diamondback Income Statement Disclosures) (Details)

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Equity Investments Equity Investment (Diamondback Income Statement Disclosures) (Details) (Diamondback Energy LLC [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Diamondback Energy LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Gross revenue $ 28,909 $ 16,351
Income from operations 8,662 6,737
Net income $ 5,396 $ 1,477