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Accrued Liabilities (Components Of Accrued Liabilities) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Accrued Liabilities [Abstract]    
Accrued capital costs $ 106,405,000 $ 49,935,000
Accrued lease operating expenses 7,794,000 3,305,000
Accrued general and administrative expenses 3,397,000 3,014,000
Other accrued liabilities 2,096,000 1,985,000
Total accrued liabilities 119,692,000 58,239,000
Production taxes payable 5,700,000 3,200,000
Revenue suspense 9,500,000 2,300,000
Royalties payable $ 3,200,000 $ 300,000