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Equity Incentive Plan - Performance unit awards (Details) - Performance unit awards - USD ($)
$ in Millions
9 Months Ended
Mar. 05, 2020
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period of the awards 3 years  
Stock-based compensation not yet recognized   $ 0.9
Recognition period for costs not yet recognized   2 years 6 months
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Payout range (as a percent)   0.00%
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Payout range (as a percent)   200.00%
Payout range if ATSR Appreciation is zero or less (as a percent)   100.00%