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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, Plant And Equipment [Abstract]    
Proved oil and gas properties $ 1,152,532 $ 479,657
Less: Accumulated depreciation, depletion, amortization and impairment (174,948) (98,821)
Proved oil and gas properties, net 977,584 380,836
Unproved oil and gas properties 82,825 101,311
Other property and equipment 20,859 1,970
Less: Accumulated depreciation (1,313) (434)
Other property and equipment, net 19,546 1,536
Total property, plant and equipment, net $ 1,079,955 $ 483,683