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Equity Incentive Plan - Schedule of LTIP Unit Awards (Details) - Long Term Incentive Plan Units - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of Shares    
Nonvested at beginning of the period (in shares) 669,609 598,320
Granted (in shares) 330,945 325,507
Vested (in shares) (219,451) (254,218)
Forfeited (in shares) (16,925) 0
Nonvested at end of the period (in shares) 764,178 669,609
Weighted - Average Grant Date Fair Value    
Nonvested at beginning of the period (in dollars per share) $ 15.73 $ 18.30
Granted (in dollars per share) 14.55 13.42
Vested (in dollars per share) 16.39 18.82
Forfeited (in dollars per share) 17.02 0
Nonvested at end of the period (in dollars per share) $ 15.00 $ 15.73