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Equity Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2021
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 2018 (1)264,000$13.990% to 150%2.42%27.44%
February 2019260,000$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%
(1) In February 2021, following the end of the measurement period, the Company met certain threshold criterion and the performance units were converted into approximately 26,000 restricted shares.
Restricted share awards  
Equity Incentive Plan  
Summary of the unvested restricted shares
A summary of the unvested restricted shares as of June 30, 2021 is as follows:
 2021
 Number of
Shares
Weighted-Average
Grant Date
Fair Value
Unvested at January 1, 20211,252,228 $15.17 
Granted 1,733,358 15.93 
Vested(408,776)15.46 
Forfeited(1,382)11.29 
Unvested at June 30, 20212,575,428 $15.64