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Basis points added to the reference rate related to Investment Grade Periods.

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Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be repurchased in the event of a change of control.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility during an Investment Grade period.

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Time period prior to maturity date of senior notes as one option for maturity date of Credit Facility.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2017	Sep. 30, 2019	Dec. 31, 2018	Dec. 21, 2016	Mar. 17, 2015	Sep. 18, 2014	May 06, 2014	Nov. 05, 2013
Long- term Debt
Long-term debt	$ 3,758,868	$ 3,758,868			$ 5,461,688
Gain on extinguishment of debt repurchased		36,419	$ (1,500)
Debt Repurchase Program
Long- term Debt
Gain on extinguishment of debt repurchased	36,000
Notional amount debt repurchased	$ 225,000	225,000
Weighted average discount price	17.00%
Parent (Antero)
Long- term Debt
Net unamortized premium	$ 791	791			1,241
Net unamortized debt issuance costs	(19,464)	(19,464)			(26,700)
Long-term debt	3,758,868	3,758,868			3,829,541
Credit Facility
Long- term Debt
Long-term debt	552,000	552,000			$ 405,000
Current borrowing base	4,500	4,500
Lender commitments	$ 2,640,000	$ 2,640,000		$ 2,500,000
Time period prior to maturity date of senior notes as one option for maturity date of Credit Facility		91 days
Weighted average interest rate (as a percent)	3.28%	3.28%			3.95%
Outstanding letters of credit	$ 623,000	$ 623,000			$ 685,000
Credit Facility \| Parent (Antero)
Long- term Debt
Bank credit facility long-term debt	$ 552,000	$ 552,000			405,000
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		0.25%
Credit Facility \| Minimum \| Investment Grade Period
Long- term Debt
Basis points added to the reference rate		0.125%
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		2.25%
Credit Facility \| Maximum \| Investment Grade Period
Long- term Debt
Basis points added to the reference rate		1.75%
5.375% senior notes due 2021
Long- term Debt
Interest rate (as a percent)	5.375%	5.375%								5.375%
Senior notes issued										$ 1,000,000
Issue price as percentage of par value										100.00%
Redemption price of the debt instrument in the event of change of control (as a percent)		101.00%
5.375% senior notes due 2021 \| Parent (Antero)
Long- term Debt
Long-term notes payable	$ 952,500	$ 952,500			1,000,000
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	$ 25,000
Outstanding balance	$ 0	$ 0
Stand-alone revolving note \| Other current liabilities
Long- term Debt
Outstanding balance					5,400
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
Interest rate (as a percent)	5.125%	5.125%							5.125%
Senior notes issued								$ 500,000	$ 600,000
Issue price as percentage of par value								100.50%	100.00%
Redemption price		101.281%
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 \| Parent (Antero)
Long- term Debt
Long-term notes payable	$ 923,041	$ 923,041			1,100,000
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
Interest rate (as a percent)	5.625%	5.625%					5.625%
Senior notes issued							$ 750,000
Issue price as percentage of par value							100.00%
Redemption price		102.813%
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 \| Parent (Antero)
Long- term Debt
Long-term notes payable	$ 750,000	$ 750,000			750,000
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
Long- term Debt
Interest rate (as a percent)	5.375%	5.375%
5.00% senior notes due 2025
Long- term Debt
Interest rate (as a percent)	5.00%	5.00%				5.00%
Senior notes issued						$ 600,000
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%
5.00% senior notes due 2025 \| Parent (Antero)
Long- term Debt
Long-term notes payable	$ 600,000	$ 600,000			600,000
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%
Reportable legal entity \| Parent (Antero)
Long- term Debt
Long-term debt	$ 3,758,868	$ 3,758,868			3,829,541
Gain on extinguishment of debt repurchased		$ 36,419	$ (1,205)
Antero Midstream Partners LP
Long- term Debt
Net unamortized debt issuance costs					(7,853)
Long-term debt					1,632,147
Antero Midstream Partners LP \| Midstream Credit Facility
Long- term Debt
Bank credit facility long-term debt					990,000
Antero Midstream Partners LP \| 5.375% senior notes due 2024
Long- term Debt
Long-term notes payable					$ 650,000