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Long-Term Debt (Details Textuals) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Rate
Jun. 30, 2012
Jun. 30, 2013
Rate
Jun. 30, 2012
Feb. 28, 2013
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Jun. 30, 2013
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Dec. 31, 2012
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Mar. 07, 2013
9.75% Senior Subordinated Notes due 2016 [Member]
Rate
Feb. 19, 2013
9.75% Senior Subordinated Notes due 2016 [Member]
Rate
Jan. 22, 2013
9.75% Senior Subordinated Notes due 2016 [Member]
Feb. 19, 2013
9.5% Senior Subordinated Notes due 2016 [Member]
Rate
May 01, 2013
9.5% Senior Subordinated Notes due 2016 [Member]
Rate
Jan. 22, 2013
9.5% Senior Subordinated Notes due 2016 [Member]
Jun. 30, 2013
Bank Credit Agreement [Member]
Rate
May 01, 2013
Bank Credit Agreement [Member]
Mar. 31, 2010
Bank Credit Agreement [Member]
Jun. 30, 2013
Bank Credit Agreement [Member]
Minimum [Member]
Rate
Jun. 30, 2013
Bank Credit Agreement [Member]
Maximum [Member]
Rate
Jun. 30, 2013
Debt Instrument, Redemption, Period One [Member]
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Jun. 30, 2013
Debt Instrument, Redemption, Period Two [Member]
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Jun. 30, 2013
Debt Instrument, Redemption, Period Three [Member]
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Jun. 30, 2013
Debt Instrument, Redemption, Period Four [Member]
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Jun. 30, 2013
Initial Redemption Period with Proceeds from Equity Offering [Member]
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Jun. 30, 2013
Initial Redemption Period with Make-Whole Premium [Member]
4 5/8% Senior Subordinated Notes Due 2023 [Member]
Rate
Long Term Debt (Textuals) [Abstract]                                                
Interest in guarantor subsidiaries 100.00%   100.00%                                          
Face Value of Notes Issued         $ 1,200,000,000                                      
Debt Instrument, Maturity Date           Jul. 15, 2023                                    
Debt Instrument, Interest Rate, Stated Percentage           4.625%                                    
Selling Price Of Debt Instrument         100.00%                                      
Proceeds from issuance of subordinated long term debt, net of commissions and fees           1,180,000,000                                    
Debt Instrument, Redemption Period, Start Date                                     on or after January 15, 2018 on or after January 15, 2019 on or after January 15, 2020 on or after January 15, 2021 Prior to January 15, 2016 prior to January 15, 2018
Debt Instrument, Redemption Price, Percentage               104.875% 105.425%   106.869% 104.75%             102.313% 101.542% 100.771% 100.00% 104.625% 100.00%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed                                             35.00% 100.00%
Leverage Ratio Requirement for Restricted Payments           at least 2.5 to 1                                    
Subordinated Debt           1,200,000,000 0     426,400,000     224,900,000                      
Debt Instrument, Repurchased Face Amount               234,700,000 191,700,000   186,700,000 38,200,000                        
Loss on early extinguishment of debt 428,000 0 44,651,000 0                                        
$1.6 Billion Revolving Credit Facility [Abstract]                                                
Borrowing Base of Denbury credit facility                             $ 1,600,000,000 $ 1,600,000,000                
Weighted average interest rate on Bank Credit Facility                           1.70%                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                                 0.375% 0.50%