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Long-Term Debt (Details) - USD ($) |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2019 | Feb. 25, 2019 | Sep. 13, 2016 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 03, 2016
Long-term debt |  |  |  |  |  |
Net unamortized debt issuance costs |  |  |  | $ (22,588,000) | $ (23,101,000) |
Total long-term debt |  |  |  | 3,103,762,000 | 2,892,249,000 |
New revolving credit facility |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  |  | 1,170,500,000 | 959,500,000 |
New revolving credit facility | Antero Midstream Partners |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  |  | 1,200,000,000 | $ 960,000,000 |
Maximum borrowing capacity |  |  |  | 2,130,000,000 |  |
Weighted average interest rate (as a percent) |  |  |  |  | 3.15% |
Outstanding balance |  |  |  | $ 0 | $ 0 |
Weighted average interest rate |  |  |  | 2.24% |  |
New revolving credit facility | Investment Grade Period |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Margin rates (in basis points) |  |  |  | 0.25% |  |
New revolving credit facility | Investment Grade Period | Minimum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Commitment fees on the unused portion (as a percent) |  |  |  | 0.175% |  |
New revolving credit facility | Investment Grade Period | Maximum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Commitment fees on the unused portion (as a percent) |  |  |  | 0.375% |  |
New revolving credit facility | Not Investment Grade Period | Minimum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Commitment fees on the unused portion (as a percent) |  |  |  | 0.25% |  |
New revolving credit facility | Not Investment Grade Period | Maximum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Commitment fees on the unused portion (as a percent) |  |  |  | 0.375% |  |
5.375% Senior Notes due 2024 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  |  | $ 652,600,000 | 652,600,000 |
5.375% Senior Notes due 2024 | Finance Corp and together with Antero Midstream Partners |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Face amount |  |  | $ 650,000,000 |  |  |
Interest rate (as a percent) |  |  | 5.375% |  |  | 5.375%
Debt instrument redemption percentage upon change of control |  |  | 101.00% |  |  |
5.375% Senior Notes due 2024 | Redemption period one | Finance Corp and together with Antero Midstream Partners |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage |  |  | 104.031% |  |  |
5.375% Senior Notes due 2024 | Redemption period two | Finance Corp and together with Antero Midstream Partners |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage |  |  | 100.00% |  |  |
5.75% Senior Notes Due 2027 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  |  | 653,250,000 | 653,250,000 |
Face amount |  | $ 650,000,000 |  |  |  |
Interest rate (as a percent) |  | 5.75% |  |  |  |
Debt instrument redemption percentage upon change of control |  | 101.00% |  |  |  |
5.75% Senior Notes Due 2027 | Maximum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Percent of aggregate principal amount that can be redeemed |  | 35.00% |  |  |  |
5.75% Senior Notes Due 2027 | Redemption period one |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage |  | 102.875% |  |  |  |
5.75% Senior Notes Due 2027 | Redemption period two |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage |  | 100.00% |  |  |  |
5.75% Senior Notes Due 2027 | Redemption period three |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage |  | 105.75% |  |  |  |
Debt instrument redemption percentage with payment of premium and interest |  | 100.00% |  |  |  |
5.75% Senior Notes Due 2028 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  |  | $ 650,000,000 | $ 650,000,000 |
Face amount | $ 650,000,000 |  |  |  |  |
Interest rate (as a percent) | 5.75% |  |  |  |  |
Debt instrument redemption percentage upon change of control | 101.00% |  |  |  |  |
5.75% Senior Notes Due 2028 | Maximum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Percent of aggregate principal amount that can be redeemed | 35.00% |  |  |  |  |
5.75% Senior Notes Due 2028 | Redemption period one |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage | 102.875% |  |  |  |  |
5.75% Senior Notes Due 2028 | Redemption period two |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage | 100.00% |  |  |  |  |
5.75% Senior Notes Due 2028 | Redemption period three |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument redemption percentage | 105.75% |  |  |  |  |
Debt instrument redemption percentage with payment of premium and interest | 100.00% |  |  |  |  |

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