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Supplemental Information On Oil And Gas Exploration And Production Activities (Capitalized Costs Related To Oil And Gas Producing Activities) (Details)

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Supplemental Information On Oil And Gas Exploration And Production Activities (Capitalized Costs Related To Oil And Gas Producing Activities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Oil and Gas Exploration and Production Industries Disclosures [Abstract]    
Proven properties $ 984,795 $ 897,130
Unproven properties 626,295 132,912
Gross capitalized costs 1,611,090 1,030,042
Accumulated depreciation, depletion, amortization and impairment reserve (661,442) (571,213)
Net capitalized costs $ 949,648 $ 458,829