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Equity Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of the unvested restricted shares
A summary of the unvested restricted shares is as follows:

 202120202019
 Number of
Shares		Weighted-Average
Grant Date Fair
Value		Number of
Shares		Weighted-Average
Grant Date Fair
Value		Number of
Shares		Weighted-Average
Grant Date Fair
Value
Unvested at January 1, 1,252,228 $15.17 940,202 $20.21 740,792 $21.89 
Granted 1,739,327 15.92 801,463 11.95 530,436 18.69 
Vested (513,342)16.51 (480,444)19.59 (312,131)21.63 
Forfeited(97,930)15.22 (8,993)18.80 (18,895)20.03 
Unvested at December 31,2,380,283 $15.43 1,252,228 $15.17 940,202 $20.21 
Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest
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.