Current report filing

Contingencies (Details)

v2.4.0.8
Contingencies (Details) (USD $)
12 Months Ended 0 Months Ended 36 Months Ended 1 Months Ended 0 Months Ended 4 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Shell Trading Company [Member]
Oil [Member]
Dec. 31, 2011
Shell Trading Company [Member]
Oil [Member]
Dec. 31, 2010
Shell Trading Company [Member]
Oil [Member]
Dec. 31, 2012
Diamondback [Member]
Oil [Member]
Dec. 31, 2011
Diamondback [Member]
Oil [Member]
Dec. 31, 2010
Diamondback [Member]
Oil [Member]
Dec. 31, 2012
Diamondback [Member]
Natural Gas Liquids [Member]
Dec. 31, 2011
Diamondback [Member]
Natural Gas Liquids [Member]
Dec. 31, 2011
Diamondback [Member]
Natural Gas [Member]
Dec. 31, 2010
Diamondback [Member]
Natural Gas [Member]
Dec. 31, 2012
North American Gas [Member]
Natural Gas [Member]
Dec. 31, 2012
Hess [Member]
Natural Gas [Member]
Dec. 31, 2012
Chevron [Member]
Natural Gas [Member]
Dec. 31, 2011
Chevron [Member]
Natural Gas [Member]
Dec. 31, 2010
Chevron [Member]
Natural Gas [Member]
Dec. 31, 2011
Hilcorp Energy Company [Member]
Natural Gas [Member]
Dec. 31, 2010
Hilcorp Energy Company [Member]
Natural Gas [Member]
Dec. 31, 2012
Maximum [Member]
Apr. 20, 2009
Louisiana Department of Revenue Tax Litigation [Member]
Dec. 31, 2007
Louisiana Department of Revenue Tax Litigation [Member]
Dec. 31, 2010
Louisiana Department of Revenue Tax Litigation [Member]
lawsuit
Nov. 30, 2006
Cudd Pressure Control Litigation [Member]
defendant
Nov. 03, 2008
Cudd Pressure Control Litigation [Member]
Royalty Fee [Member]
Nov. 03, 2008
Cudd Pressure Control Litigation [Member]
Minimum [Member]
Attorney Fees [Member]
Dec. 09, 2010
Reed Litigation [Member]
defendant
plaintiff
acre
Jul. 31, 2010
Reed Litigation [Member]
plaintiff
Jul. 31, 2010
Reed Litigation [Member]
defendant
Dec. 07, 2010
Reed Litigation [Member]
defendant
acre
Dec. 06, 2010
Reed Litigation [Member]
acre
Jul. 31, 2010
Reed Litigation [Member]
Individual Counterparty [Member]
plaintiff
Jul. 31, 2010
Reed Litigation [Member]
Limited Liability Company [Member]
plaintiff
Loss Contingencies [Line Items]                                                                
Alleged severance tax                                         $ 1,800,000                      
Lawsuits filed value                                       2,275,729       11,800,000 450,000              
Number of pending claims                                           2                    
Number of defendants                                             6     6 15 15 21      
Damages sought as a percentage of final judgement                                                 10.00%              
Number of plaintiffs                                                   4         6 1
Original number of acreage in litigation                                                           240    
Amended number of acreage in litigation                                                         1,700      
FDIC insured amount                                     250,000                          
Uninsured cash amount $ 166,588,000                                                              
Percentage of production sold   92.00% 93.00% 75.00% 8.00% 7.00% 19.00% 91.00% 100.00% 22.00% 50.00% 41.00% 18.00% 16.00% 27.00% 32.00% 50.00% 10.00%