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Equity Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 2020
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 2017 (1)259,000$14.930% to 150%1.57%25.73%
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%
(1) In February 2020, following the end of the measurement period, the Company did not meet certain target criterion and no performance units were converted into 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, 2020 is as follows:
 2020
 Number of
Shares		Weighted-Average
Grant Date
Fair Value
Unvested at January 1, 2020940,202  $20.21  
Granted (1)801,463  11.95  
Vested(206,484) 19.83  
Forfeited(8,434) 19.43  
Unvested at June 30, 20201,526,747  $15.93  
(1)During the six months ended June 30, 2020, the Company issued restricted shares to officers and employees that vest on an annual basis over service periods between two and four years.