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Equity Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of the unvested restricted shares
A summary of the unvested restricted shares is as follows:
 202020192018
 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, 940,202 $20.21 740,792 $21.89 700,325 $22.88 
Granted 801,463 11.95 530,436 18.69 592,673 21.42 
Vested (480,444)19.59 (312,131)21.63 (438,881)22.92 
Forfeited(8,993)18.80 (18,895)20.03 (113,325)21.58 
Unvested at December 31,1,252,228 $15.17 940,202 $20.21 740,792 $21.89 
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 2018264,000$13.990% to 150%2.42%27.44%
February 2019260,000$19.160% to 200%2.52%27.19%
February 2020489,000$12.060% to 200%1.08%23.46%