Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Contingencies) (Details)

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Commitments and Contingencies (Contingencies) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 36 Months Ended 0 Months Ended 4 Months Ended 0 Months Ended
Apr. 20, 2009
Louisiana Department of Revenue Tax Litigation [Member]
Dec. 31, 2010
Louisiana Department of Revenue Tax Litigation [Member]
lawsuit
Dec. 31, 2007
Louisiana Department of Revenue Tax Litigation [Member]
Dec. 09, 2010
Reed Litigation [Member]
defendant
plaintiff
acre
Jul. 31, 2010
Reed Litigation [Member]
plaintiff
Dec. 07, 2010
Reed Litigation [Member]
defendant
acre
Dec. 06, 2010
Reed Litigation [Member]
acre
Jul. 31, 2010
Individual Counterparty [Member]
Reed Litigation [Member]
plaintiff
Jul. 31, 2010
Limited Liability Company [Member]
Reed Litigation [Member]
plaintiff
Loss Contingencies [Line Items]                  
Alleged severance tax   $ 12.0 $ 1.8            
Lawsuits filed value $ 2.3 $ 4.4              
Number of pending claims   2              
Number of defendants       6 15 21      
Number of plaintiffs       4       6 1
Original number of acreage in litigation             240    
Amended number of acreage in litigation           1,700