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Shareholders' Equity - Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share Award Plan      
Unvested shares, scheduled to vest      
Shares reserved for issuance (in shares) 1,401,160    
Award Plans      
Number of Shares      
Unvested shares, beginning of year (in shares) 425,030 325,900 194,540
Shares awarded (in shares) 433,500 340,700 305,400
Shares vested (in shares) (266,300) (240,470) (173,190)
Shares forfeited (in shares) (3,400) (1,100) (850)
Unvested shares, end of year (in shares) 588,830 425,030 325,900
Weighted Average Grant Date Fair Value      
Unvested shares, beginning of year (in dollars per share) $ 11.93 $ 14.71 $ 26.59
Shares awarded (in dollars per share) 6.63 11.26 8.91
Shares vested (in dollars per share) 10.20 14.78 17.76
Shares forfeited (in dollars per share) 12.08 12.96 26.93
Unvested shares, end of year (in dollars per share) $ 8.81 $ 11.93 $ 14.71
Unvested shares, scheduled to vest      
2023 (in shares) 206,940    
2024 (in shares) 173,920    
2025 (in shares) 131,040    
2026 (in shares) 76,900    
Estimated future compensation expense $ 4,452    
Weighted average period over which the compensation expense will be recorded 22 months    
Compensation expense $ 2,775 $ 2,964 $ 3,206