Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

v3.10.0.1
Long-Term Debt (Details) - USD ($)
6 Months Ended
Oct. 26, 2017
Jun. 30, 2018
Dec. 31, 2017
Dec. 21, 2016
Sep. 13, 2016
Mar. 17, 2015
Sep. 18, 2014
May 06, 2014
Nov. 05, 2013
Long- term Debt                  
Net unamortized premium   $ 1,382,000 $ 1,520,000            
Net unamortized debt issuance costs   (29,604,000) (32,430,000)            
Long-term debt   5,288,344,000 4,800,090,000            
Antero Midstream Partners LP                  
Long- term Debt                  
Net unamortized debt issuance costs   (8,434,000) (9,000,000)            
Outstanding letters of credit   0              
Midstream Credit Facility | Antero Midstream Partners LP                  
Long- term Debt                  
Bank credit facility long-term debt   770,000,000 $ 555,000,000            
Maximum amount of the Credit Facility   $ 1,500,000,000              
Weighted average interest rate (as a percent)   3.34% 2.81%            
Midstream Credit Facility | Minimum                  
Long- term Debt                  
Commitment fees on the unused portion during an Investment Grade period (as a percent) 0.175%                
Midstream Credit Facility | Minimum | Antero Midstream Partners LP                  
Long- term Debt                  
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)   0.25%              
Midstream Credit Facility | Minimum | Not Investment Grade Period | Antero Midstream Partners LP                  
Long- term Debt                  
Basis points added to the reference rate   25.00%              
Midstream Credit Facility | Minimum | Investment Grade Period | Antero Midstream Partners LP                  
Long- term Debt                  
Basis points added to the reference rate   12.50%              
Midstream Credit Facility | Maximum                  
Long- term Debt                  
Commitment fees on the unused portion during an Investment Grade period (as a percent) 0.375%                
Midstream Credit Facility | Maximum | Antero Midstream Partners LP                  
Long- term Debt                  
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)   0.375%              
Midstream Credit Facility | Maximum | Not Investment Grade Period | Antero Midstream Partners LP                  
Long- term Debt                  
Basis points added to the reference rate   225.00%              
Midstream Credit Facility | Maximum | Investment Grade Period | Antero Midstream Partners LP                  
Long- term Debt                  
Basis points added to the reference rate   200.00%              
Credit Facility                  
Long- term Debt                  
Bank credit facility long-term debt   $ 455,000,000 $ 185,000,000            
Current borrowing base   4,500,000,000              
Lender commitments   $ 2,500,000,000              
Time period prior to maturity date of senior notes as one option for maturity date of Credit Facility 91 years                
Weighted average interest rate (as a percent)   3.88% 2.96%            
Outstanding letters of credit   $ 692,000,000 $ 705,000,000            
Credit Facility | Minimum                  
Long- term Debt                  
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)   0.30%              
Commitment fees on the unused portion during an Investment Grade period (as a percent)   0.15%              
Credit Facility | Minimum | Not Investment Grade Period                  
Long- term Debt                  
Basis points added to the reference rate   25.00%              
Credit Facility | Minimum | Investment Grade Period                  
Long- term Debt                  
Basis points added to the reference rate   12.50%              
Credit Facility | Maximum                  
Long- term Debt                  
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)   0.375%              
Commitment fees on the unused portion during an Investment Grade period (as a percent)   0.30%              
Credit Facility | Maximum | Not Investment Grade Period                  
Long- term Debt                  
Basis points added to the reference rate   225.00%              
Credit Facility | Maximum | Investment Grade Period                  
Long- term Debt                  
Basis points added to the reference rate   175.00%              
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
Issue price as percentage of par value                 100.00%
Redemption price   102.688%              
Redemption price 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, 2019                  
Long- term Debt                  
Redemption price   100.00%              
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% 100.00%  
Redemption price   102.563%              
Redemption price 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, 2020                  
Long- term Debt                  
Redemption price   100.00%              
5.625% senior notes due 2023                  
Long- term Debt                  
Long-term notes payable   $ 750,000,000 750,000,000            
Interest rate (as a percent)           5.625%      
Senior notes issued           $ 750,000,000      
Issue price as percentage of par value           100.00%      
Redemption price   104.219%              
Redemption price 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, 2021                  
Long- term Debt                  
Redemption price   100.00%              
5.375% senior notes due 2024 | Antero Midstream Partners LP                  
Long- term Debt                  
Long-term notes payable   $ 650,000,000 650,000,000            
Interest rate (as a percent)         5.375%        
Senior notes issued         $ 650,000,000        
Issue price as percentage of par value         100.00%        
Redemption price at which notes may be required to be repurchased in event of change of control   101.00%              
5.375% senior notes due 2024 | On or after September 15, 2019 | Antero Midstream Partners LP                  
Long- term Debt                  
Redemption price   104.031%              
5.375% senior notes due 2024 | On or after September 15, 2022 | Antero Midstream Partners LP                  
Long- term Debt                  
Redemption price   100.00%              
5.375% senior notes due 2024 | On or before September 15, 2019 | Antero Midstream Partners LP                  
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)   105.375%              
5.375% senior notes due 2024 | Prior to September 15, 2019 | Antero Midstream Partners LP                  
Long- term Debt                  
Redemption price   100.00%              
5.00% senior notes due 2025                  
Long- term Debt                  
Long-term notes payable   $ 600,000,000 $ 600,000,000 $ 600,000,000          
Interest rate (as a percent)       5.00%          
Issue price as percentage of par value       100.00%          
Redemption price at which notes may be required to be repurchased in event of change of control   101.00%              
5.00% senior notes due 2025 | Prior to March 1, 2020                  
Long- term Debt                  
Redemption price   100.00%              
5.00% senior notes due 2025 | On or before March 1, 2020                  
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)   105.00%              
5.00% senior notes due 2025 | On or after March 1, 2020                  
Long- term Debt                  
Redemption price   103.75%              
5.00% senior notes due 2025 | On or after March1, 2023                  
Long- term Debt                  
Redemption price   100.00%