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Equity Incentive Plan - Phantom unit award activity (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 05, 2021
Weighted-average grant-date fair value (per award)    
Stock price (USD per share)   $ 34.24
Phantom unit awards    
Phantom units    
Outstanding at the beginning of the period (shares) 75,000  
Granted (shares) 5,000  
Vested (shares) (25,000)  
Outstanding at the end of the period (shares) 55,000