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Equity Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 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$19.16
0% to 200%
2.52%27.19%
February 2020489,000$11.59
0% to 200%
1.08%23.46%
February 2021431,151$20.90
0% to 200%
0.23%69.47%
February 2022407,024$21.96
0% 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 converted into approximately 133,000 restricted shares. Half of the restricted shares vested immediately with the remaining half vesting in February 2023. As of June 30, 2022, there were approximately 67,000 unvested restricted shares related to the conversion of the performance units. The total fair value of the vested shares related to the conversion of the performance units (calculated as the number of vested shares multiplied by the vesting date share price) during the six months ended June 30, 2022 was approximately $0.8 million.
Restricted share awards  
Equity Incentive Plan  
Summary of the unvested restricted shares
A summary of the unvested restricted shares as of June 30, 2022 is as follows:
 2022
 Number of
Shares		Weighted-Average
Grant Date
Fair Value
Unvested at January 1, 20222,380,283 $15.43 
Granted 569,600 15.10 
Vested(619,285)15.69 
Forfeited(6,065)13.56 
Unvested at June 30, 20222,324,533 $15.28