Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

v3.4.0.3
Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 17, 2015
Sep. 18, 2014
May. 06, 2014
Nov. 05, 2013
Feb. 04, 2013
Nov. 19, 2012
Mar. 31, 2016
Apr. 08, 2016
Dec. 31, 2015
Long- term Debt                  
Net unamortized premium             $ 6,245   $ 6,513
Net unamortized debt issuance costs             (38,436)   (39,731)
Long-term debt Noncurrent             4,702,809   4,668,782
Midstream Credit Facility Member                  
Long- term Debt                  
Bank credit facility long-term debt             680,000   $ 620,000
Maximum amount of the Credit Facility             $ 1,500,000    
Weighted average interest rate (as a percent)             1.94%   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             $ 680,000   $ 707,000
Current borrowing base             4,500,000    
Lender commitments             $ 4,000,000    
Weighted average interest rate (as a percent)             2.38%   2.32%
Outstanding letters of credit             $ 702,000   $ 702,000
Bank credit facility | Subsequent event                  
Long- term Debt                  
Current borrowing base               $ 4,500,000  
Lender commitments               $ 4,000,000  
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   525,000
Interest rate (as a percent)           6.00%      
Senior notes issued         $ 225,000 $ 300,000      
Issue price as percentage of par value         103.00% 100.00%      
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             100.00%    
5.375% senior notes due 2021                  
Long- term Debt                  
Long-term notes payable             $ 1,000,000   1,000,000
Interest rate (as a percent)       5.375%          
Senior notes issued       $ 1,000,000          
Issue price as percentage of par value       100.00%          
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%    
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)             105.375%    
5.375% senior notes due 2021 | Prior to May 1, 2015                  
Long- term Debt                  
Percentage of principal amount at which notes may be required to be repurchased in event of change of control             101.00%    
Stand-alone revolving note                  
Long- term Debt                  
Maximum amount of the Credit Facility             $ 25,000    
Outstanding balance             $ 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   1,100,000
Interest rate (as a percent)     5.125%            
Senior notes issued   $ 500,000 $ 600,000            
Issue price as percentage of par value   100.50% 100.00%            
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             100.00%    
5.125% senior notes due 2022 | Prior to December 1, 2015                  
Long- term Debt                  
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                  
Long- term Debt                  
Long-term notes payable             $ 750,000   $ 750,000
Interest rate (as a percent) 5.625%                
Senior notes issued $ 750,000                
Issue price as percentage of par value 100.00%                
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%    
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 | On Or After June 1, 2018                  
Long- term Debt                  
Redemption price             104.219%    
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings             35.00%    
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%    
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)             105.625%