Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Purchase Price Allocation For Acquisition Of Properties) (Details)

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Acquisitions (Purchase Price Allocation For Acquisition Of Properties) (Details) (USD $)
In Thousands, unless otherwise specified
May 11, 2011
Yellow Rose Properties [Member]
Aug. 10, 2011
Fairway Properties [Member]
Business Acquisition [Line Items]    
Oil and natural gas properties and equipment $ 396,902 $ 50,682
Asset retirement obligations-non-current (382) (7,812)
Long-term liability (2,143)  
Total cash paid $ 394,377 $ 42,870