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Equity Incentive Plan (Tables)
3 Months Ended
Mar. 31, 2022
Equity Incentive Plan  
Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block]
A summary of the performance unit awards is as follows:
Date of AwardNumber of
Units Granted

Grant Date Fair
Value
Conversion RangeRisk Free Interest RateVolatility
February 2019 (1)260,000$19.160% to 200%2.52%27.19%
February 2020489,000$11.590% to 200%1.08%23.46%
February 2021431,151$20.900% to 200%0.23%69.47%
February 2022407,024$21.960% to 200%1.7%70.15%
(1) In February 2022, following the end of the measurement period, the Company met certain threshold criterion and the performance units will convert into approximately 133,000 restricted shares.
Restricted share awards  
Equity Incentive Plan  
Summary of the unvested restricted shares
A summary of the unvested restricted shares as of March 31, 2022 is as follows:
 2022
 Number of
Shares
Weighted-Average
Grant Date
Fair Value
Unvested at January 1, 20222,380,283 $15.43 
Granted 432,779 15.22 
Vested(234,897)15.63 
Forfeited(4,629)13.34 
Unvested at March 31, 20222,573,536 $15.38