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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Diamondback Energy LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Gross revenue $ 45,394 $ 16,029 $ 74,303 $ 32,381
Income from operations 19,383 4,306 28,045 11,044
Net income $ 14,471 $ 13,623 $ 19,867 $ 15,101