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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Stock-based compensation expense
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Equity based compensation expense recognized	$ 3,329	$ 8,903
Antero Resources Corporation Long Term Incentive Plan Member
Stock-based compensation expense
Number of stock-based compensation awards authorized	16,906,500
Number of shares available for future grant under the Plan	1,742,720
Midstream Plan
Stock-based compensation expense
Number of stock-based compensation awards authorized	10,000,000
Restricted stock awards
Stock-based compensation expense
Equity based compensation expense recognized	$ 1,878	3,972
Stock options
Stock-based compensation expense
Equity based compensation expense recognized		344
Performance share unit awards
Stock-based compensation expense
Equity based compensation expense recognized	922	2,959
Antero Midstream Partners Phantom Unit Awards
Stock-based compensation expense
Equity based compensation expense recognized	160	1,125
Equity awards issued to directors
Stock-based compensation expense
Equity based compensation expense recognized	$ 369	$ 503
Antero Midstream Corporation \| Midstream Plan
Stock-based compensation expense
Conversion rate of units converted into restricted stock	1.8926
Antero Midstream Corporation \| Midstream Plan \| Common Stock
Stock-based compensation expense
Conversion rate of units converted into restricted stock	1