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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Property, Plant And Equipment [Abstract]    
Proved oil and gas properties $ 1,434,402,000 [1] $ 1,152,532,000 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (212,831,000) (174,948,000)
Proved oil and gas properties, net 1,221,571,000 977,584,000
Unproved oil and gas properties 81,386,000 82,825,000
Oil and gas properties, net 1,302,957,000 1,060,409,000
Other property and equipment 38,660,000 20,859,000
Less: Accumulated depreciation (2,605,000) (1,313,000)
Other property and equipment, net 36,055,000 19,546,000
Total property, plant and equipment, net 1,339,012,000 1,079,955,000
Asset retirement costs 14,100,000 11,400,000
Capitalized interest $ 3,900,000 $ 3,100,000
[1] Included in the Company's proved oil and gas properties are estimates of future asset retirement costs of $14.1 million and $11.4 million at March 31, 2012 and December 31, 2011, respectively. In addition, the Company's proved oil and gas properties include capitalized interest of $3.9 million and $3.1 million at March 31, 2012 and December 31, 2011, respectively.