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Derivative Instruments (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 1 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 2 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 3 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 5 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Crude Oil Sales - Three-way collars - Derivative 7 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Natural Gas Sales - Call Options - Derivative 1
Full 2013 Term [Member]
Natural Gas [Member]
Sep. 30, 2012
Natural Gas Sales - Call Options - Derivative 2
Full 2013 Term [Member]
Natural Gas [Member]
Sep. 30, 2012
Natural Gas Sales - Call Options - Derivative 3
Full 2013 Term [Member]
Natural Gas [Member]
Sep. 30, 2012
Natural Gas Sales - Call Options - Derivative 4
Full 2013 Term [Member]
Natural Gas [Member]
Sep. 30, 2012
Termination of Natural Gas Derivatives
Natural Gas [Member]
Mar. 31, 2011
Termination of Natural Gas Derivatives
Natural Gas [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 1 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 2 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 3 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 5 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Put
Crude Oil Sales - Three-way collars - Derivative 7 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 1 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 2 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 3 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 5 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Purchased Put
Crude Oil Sales - Three-way collars - Derivative 7 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 1 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 2 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 3 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2013 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 4 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 5 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2014 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 6 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Sold Call
Crude Oil Sales - Three-way collars - Derivative 7 [Member]
Full 2015 Term [Member]
Crude Oil [Member]
Sep. 30, 2012
Natural Gas [Member]
Full 2012 Term [Member]
Sep. 30, 2012
Natural Gas [Member]
Full 2013 Term [Member]
Sep. 30, 2012
Natural Gas [Member]
Full 2014 Term [Member]
Sep. 30, 2012
Natural Gas [Member]
Full 2015 Term [Member]
Sep. 30, 2012
Crude Oil [Member]
Full 2012 Term [Member]
Sep. 30, 2012
Crude Oil [Member]
Full 2013 Term [Member]
Sep. 30, 2012
Crude Oil [Member]
Full 2014 Term [Member]
Sep. 30, 2012
Crude Oil [Member]
Full 2015 Term [Member]
Derivative instruments                                                                                                                
Notional amount of derivatives (Bbl/MMBtu per day)             1,000 1,000 800 1,000 1,000 1,500 1,000 1,000 2,000 1,000 1,000 1,000 2,000   15,000                                                       0 10,000 0 0 21,000 16,800 7,500 3,000
Put (in dollars per barrel)                                           70 70 75 70 70 70 70 70 70 90 90 95 90 90 90 90 90 90                                  
Call (in dollars per barrel)                                                                               120 121.80 101.7 100 100 100 104.85 104.85 100                
Strike price                               3.50 3.50 3.50 3.50                                                                          
Deferred premium per MMBtu                               0.43 0.46 0.4975 0.5325                                                                          
Accumulated Other Comprehensive Loss                                                                                                                
Accumulated other comprehensive income (loss) before tax $ 2,800,000 $ 2,800,000   $ 2,800,000   $ 8,900,000                                                                                                    
Accumulated other comprehensive loss 1,736,000 1,736,000   1,736,000   5,517,000                                                                                                    
Reclassified unrealized losses, before tax from AOCL into earnings   2,400,000   6,100,000                                                                                                        
Reclassified unrealized losses, after tax from AOCL into earnings   1,505,000 9,604,000 3,781,000 28,649,000                                                                                                      
Net losses after-tax expected to be reclassified into earnings from AOCL during the remainder of 2012 (1,700,000)                                                                                                              
Termination of Natural Gas Derivatives                                                                                                                
Net loss resulting from termination of natural gas derivatives                                       $ (1,900,000)