Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Schedule Of Property And Equipment) (Details)

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Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties, full-cost accounting $ 2,065,918 $ 1,611,090
Office furniture and fixtures 4,831 4,476
Building 3,926 3,926
Land 260 260
Total property and equipment 2,074,935 1,619,752
Accumulated depletion, depreciation, amortization and impairment (717,007) (665,884)
Property and equipment, net $ 1,357,928 $ 953,868