Annual report pursuant to Section 13 and 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
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 1,611,090 $ 1,035,754
Office furniture and fixtures 4,476 3,692
Building 3,926 4,049
Land 260 283
Total property and equipment 1,619,752 1,043,778
Accumulated depletion, depreciation, amortization and impairment (665,884) (575,142)
Property and equipment, net $ 953,868 $ 468,636