Quarterly report pursuant to Section 13 or 15(d)

Equity Based Compensation (Details)

v3.19.2
Equity Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Mar. 12, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Additional disclosures              
Expense recognized   $ 21,543   $ 2,800 $ 32,966    
Unamortized expense   37,000   37,000 37,000    
Common Stock              
Additional disclosures              
Shares exchanged 5,782,601            
Antero Resources              
Additional disclosures              
Unamortized expense   64,000   64,000 64,000    
Midstream LTIP              
Additional disclosures              
Unamortized expense   $ 18,000   $ 18,000 $ 18,000    
Weighted average period for recognizing unrecognized stock-based compensation expense         2 years 9 months 18 days    
Restricted unit and phantom unit awards              
Number of units              
AMP LTIP Awards converted into AMC LTIP Awards         1,068,900    
Granted (in shares)         647,030    
Vested (in shares)         (335,480)    
Forfeited (in shares)         (23,674)    
Total awarded and unvested at the end of the period (in shares)   1,356,776   1,356,776 1,356,776    
Weighted average grant date fair value              
AMP LTIP Awards converted into AMC LTIP Awards (in dollars per unit)   $ 14.58   $ 14.58 $ 14.58    
Granted (in dollars per unit)         14.15    
Vested (in dollars per unit)         14.04    
Forfeited (in dollars per unit)         13.92    
Total awarded and unvested at the end of the period (in dollars per unit)   $ 14.52   $ 14.52 $ 14.52    
Aggregate intrinsic value              
Total awarded and unvested at the end of the period   $ 15,549   $ 15,549 $ 15,549    
Series B unit awards              
Additional disclosures              
Units vested             65,745
2017 AMGP LTIP              
Additional disclosures              
Expense recognized   200 $ 200   200 $ 300  
Shares exchange ratio 1.8926            
Awards issued 0            
Awards outstanding 0            
AMC LTIP              
Additional disclosures              
Expense recognized   $ 800     $ 800    
Number of stock-based compensation awards authorized 15,398,901            
Shares exchange ratio 1.8926            
Number of shares available for future grant under the Plan   13,653   13,653 13,653    
Series B Unit, Vested and Unvested              
Additional disclosures              
Shares exchange ratio 176.0041            
Exchanged B Units              
Additional disclosures              
Expense recognized   $ 18,000     $ 29,000    
Shares exchanged 17,353,999            
Common stock issued in exchange 98,600            
Unvested Series B Units              
Number of units              
AMP LTIP Awards converted into AMC LTIP Awards 32,855            
Additional disclosures              
Expense recognized   $ 9,000     $ 17,000    
ROIC PSUs              
Number of units              
Granted (in shares)         164,196    
Total awarded and unvested at the end of the period (in shares)   164,196   164,196 164,196    
Weighted average grant date fair value              
Granted (in dollars per unit)         $ 14.16    
Total awarded and unvested at the end of the period (in dollars per unit)   $ 14.16   $ 14.16 $ 14.16    
Additional disclosures              
Unamortized expense   $ 2,200   $ 2,200 $ 2,200    
Vesting period         3 years    
Weighted average period for recognizing unrecognized stock-based compensation expense         2 years 9 months 18 days    
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              
Percentage of amount of quarterly distribution in excess of threshold limit             6.00%
Threshold limit for quarterly distribution             $ 7,500
IDR LLC | Series B unit awards              
Additional disclosures              
Authorized units             98,600
Outstanding units             98,600
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              
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