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Equity Incentive Plan - Performance share awards (Details) - Performance share awards - USD ($)
$ in Millions
6 Months Ended
Feb. 28, 2019
Feb. 16, 2018
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period of the awards 3 years 3 years  
Stock-based compensation not yet recognized     $ 4.6
Recognition period for costs not yet recognized     1 year 6 months 21 days
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%