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Long-Term Debt (Details) - USD ($)
12 Months Ended
Sep. 18, 2014
Feb. 04, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 17, 2015
May. 06, 2014
Nov. 05, 2013
Nov. 19, 2012
Long- term Debt                  
Net unamortized premium     $ 6,513,000 $ 7,550,000          
Long-term debt Noncurrent     4,708,513,000 4,362,550,000          
Loss on Early Extinguishment of Debt       (20,386,000) $ (42,567,000)        
Midstream Credit Facility Member                  
Long- term Debt                  
Bank credit facility long-term debt     620,000,000            
Maximum amount of the Credit Facility     $ 1,500,000,000            
Weighted average interest rate (as a percent)     1.92%            
Midstream Credit Facility Member | Minimum                  
Long- term Debt                  
Commitment fees on the unused portion (as a percent)     0.25%            
Midstream Credit Facility Member | Maximum                  
Long- term Debt                  
Commitment fees on the unused portion (as a percent)     0.375%            
Bank credit facility                  
Long- term Debt                  
Bank credit facility long-term debt     $ 707,000,000 1,730,000,000          
Current borrowing base     4,500,000,000            
Lender commitments     4,000,000,000            
Outstanding balance     $ 707,000,000 $ 1,700,000,000          
Weighted average interest rate (as a percent)     2.32% 2.06%          
Outstanding letters of credit     $ 702,000,000 $ 387,000,000          
Bank credit facility | Minimum                  
Long- term Debt                  
Commitment fees on the unused portion (as a percent)     0.375%            
Bank credit facility | Maximum                  
Long- term Debt                  
Commitment fees on the unused portion (as a percent)     0.50%            
6.00% senior notes due 2020                  
Long- term Debt                  
Long-term notes payable     $ 525,000,000 525,000,000          
Interest rate (as a percent)                 6.00%
Senior notes issued   $ 225,000,000             $ 300,000,000
Issue price as percentage of par value   103.00%              
Redemption price     104.50%            
Percentage of principal amount at which notes may be required to be repurchased in event of change of control     101.00%            
6.00% senior notes due 2020 | On or after December 1, 2018                  
Long- term Debt                  
Redemption price of the debt instrument in the event of change of control (as a percent)     100.00%            
5.375% senior notes due 2021                  
Long- term Debt                  
Long-term notes payable     $ 1,000,000,000 1,000,000,000          
Interest rate (as a percent)               5.375%  
Senior notes issued               $ 1,000,000,000  
Percentage of principal amount at which notes may be required to be repurchased in event of change of control     101.00%            
5.375% senior notes due 2021 | On or after November 1, 2016                  
Long- term Debt                  
Redemption price     104.031%            
5.375% senior notes due 2021 | On or after November 1, 2019                  
Long- term Debt                  
Redemption price     100.00%            
5.375% senior notes due 2021 | On or before November 1, 2016                  
Long- term Debt                  
Redemption price     100.00%            
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)     105.375%            
5.375% senior notes due 2021 | Maximum | On or before November 1, 2016                  
Long- term Debt                  
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings     35.00%            
Stand-alone revolving note                  
Long- term Debt                  
Maximum amount of the Credit Facility     $ 25,000,000            
Outstanding balance     $ 0 0          
Stand-alone revolving note | Lender's Prime Rate                  
Long- term Debt                  
Basis spread on variable rate (as a percent)     1.00%            
5.125% senior notes due 2022                  
Long- term Debt                  
Long-term notes payable     $ 1,100,000,000 $ 1,100,000,000          
Interest rate (as a percent)             5.125%    
Senior notes issued $ 500,000,000           $ 600,000,000    
Issue price as percentage of par value 100.50%                
Percentage of principal amount at which notes may be required to be repurchased in event of change of control     101.00%            
5.125% senior notes due 2022 | On or after June 1, 2017                  
Long- term Debt                  
Redemption price     103.844%            
5.125% senior notes due 2022 | On or before June 1, 2017                  
Long- term Debt                  
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings     35.00%            
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)     105.125%            
5.125% senior notes due 2022 | Prior to June 1, 2017                  
Long- term Debt                  
Redemption price     100.00%            
5.125% senior notes due 2022 | On or after June 1, 2020                  
Long- term Debt                  
Redemption price of the debt instrument in the event of change of control (as a percent)     100.00%            
5.625% senior notes due 2023                  
Long- term Debt                  
Long-term notes payable     $ 750,000,000            
Interest rate (as a percent)           5.625%      
Senior notes issued           $ 750,000,000      
Percentage of principal amount at which notes may be required to be repurchased in event of change of control     101.00%            
5.625% senior notes due 2023 | Prior to June 1, 2016                  
Long- term Debt                  
Redemption price of the debt instrument in the event of change of control (as a percent)     110.00%            
5.625% senior notes due 2023 | On Or Before June 1, 2018                  
Long- term Debt                  
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings     35.00%            
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)     105.625%            
5.625% senior notes due 2023 | On Or After June 1, 2018                  
Long- term Debt                  
Redemption price     104.219%            
5.625% senior notes due 2023 | On Or After June 1, 2021                  
Long- term Debt                  
Redemption price     100.00%            
5.625% senior notes due 2023 | Prior To June 1, 2018                  
Long- term Debt                  
Redemption price     100.00%