Annual report pursuant to Section 13 and 15(d)

Equity Based Compensation (Details)

v3.20.4
Equity Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 10 Months Ended 12 Months Ended
Mar. 12, 2019
Jul. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Additional disclosures              
Expense recognized         $ 12,778 $ 73,517  
Common Stock              
Additional disclosures              
Shares exchanged 5,782,601            
Antero Midstream Partners              
Additional disclosures              
Expense recognized       $ 4,900 5,200    
Antero Resources              
Additional disclosures              
Unamortized expense         8,000    
Series B unit awards              
Additional disclosures              
Expense recognized           66,000 $ 34,000
Units vested             65,745
Shares exchange ratio 176.0041            
2017 AMGP LTIP              
Additional disclosures              
Expense recognized         $ 0 $ 200 $ 700
AM LTIP              
Number of units              
Total awarded and unvested at the beginning of the period (in shares)     1,275,990   1,275,990    
Granted (in shares)         2,592,191    
Vested (in shares)         (504,403)    
Forfeited (in shares)         (48,823)    
Total awarded and unvested at the end of the period (in shares)       1,275,990 3,314,955 1,275,990  
Weighted average grant date fair value              
Total awarded and unvested at the beginning of the period (in dollars per unit)     $ 14.38   $ 14.38    
Granted (in dollars per unit)         6.32    
Vested (in dollars per unit)         14.31    
Forfeited (in dollars per unit)         14.37    
Total awarded and unvested at the end of the period (in dollars per unit)       $ 14.38 $ 8.09 $ 14.38  
Aggregate intrinsic value              
Total awarded and unvested at the beginning of the period     $ 9,685   $ 9,685    
Total awarded and unvested at the end of the period       $ 9,685 25,558 $ 9,685  
Additional disclosures              
Expense recognized         7,600 $ 2,700  
Unamortized expense         $ 19,000    
Shares exchange ratio 1.8926            
Number of stock-based compensation awards authorized 15,398,901            
Number of shares available for future grant under the Plan         11,131,949    
Weighted average period for recognizing unrecognized stock-based compensation expense         2 years 4 months 24 days    
Cash awards granted   $ 700 $ 2,200        
Vesting period for cash awards   4 years 3 years        
Cash awards accrued in other liabilities         $ 1,800    
Series B Unit, Vested and Unvested              
Additional disclosures              
Shares exchange ratio 176.0041            
Exchanged B Units              
Additional disclosures              
Shares exchanged 17,353,999            
Common stock issued in exchange 98,600            
Unvested Series B Units              
Additional disclosures              
AMP LTIP Awards converted into AMC LTIP Awards 32,855            
ROIC PSUs              
Number of units              
Total awarded and unvested at the beginning of the period (in shares)     148,306   148,306    
Total awarded and unvested at the end of the period (in shares)       148,306 148,306 148,306  
Weighted average grant date fair value              
Total awarded and unvested at the beginning of the period (in dollars per unit)     $ 6.32   $ 6.32    
Total awarded and unvested at the end of the period (in dollars per unit)       $ 6.32 $ 6.32 $ 6.32  
Additional disclosures              
Expense recognized         $ 300 $ 200  
Unamortized expense         $ 400    
Weighted average period for recognizing unrecognized stock-based compensation expense         1 year 3 months 18 days    
Vesting period           3 years  
ROIC PSUs | Minimum              
Additional disclosures              
Number of shares of common stock that may be earned ultimately.           0.00%  
ROIC PSUs | Maximum              
Additional disclosures              
Number of shares of common stock that may be earned ultimately.           200.00%  
IDR LLC              
Additional disclosures              
Threshold limit for quarterly distribution             $ 7,500
IDR LLC | Series B unit awards              
Additional disclosures              
Authorized units             98,600
Outstanding units             98,600
Percentage of amount of quarterly distribution in excess of threshold limit             6.00%
Threshold limit for conversion of units to common shares             $ 2,000,000
IDR LLC | Series B unit awards | Maximum              
Additional disclosures              
Percentage of amount of equity value in excess of threshold limit for conversion of units to common shares             6.00%
IDR LLC | Series B Unit Awards classified as equity              
Number of units              
Granted (in shares)         0 0  
Additional disclosures              
Floor equity value $ 2,000,000            
Expected volatility (as a percent) 40.00%            
Risk free rate (as a percent) 2.51%            
Weighted average cost of capital (as a percent) 7.25%            
Estimated value (in dollars per unit) $ 1,257