Quarterly report pursuant to Section 13 or 15(d)

Equity Investments Equity Investment (Diamondback Balance Sheet Disclosure) (Details)

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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
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