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Share-Based Compensation Plan - Service Condition Restricted Share Activity (Details) - Restricted common shares - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Unvested beginning balance (in shares) 149,179 127,732 137,105
Granted (in shares) 390,242 88,430 52,609
Vested (in shares) (72,824) (66,276) (61,982)
Forfeited (in shares) (6,787) (707) 0
Cancelled (in shares) (217,083)    
Unvested ending balance (in shares) 242,727 149,179 127,732
Weighted-Average Grant Date Fair Value      
Unvested beginning balance (in usd per share) $ 33.37 $ 32.22 $ 30.05
Granted (in usd per share) 23.62 32.64 36.86
Vested (in usd per share) 33.13 30.20 31.35
Forfeited (in usd per share) 27.68 32.70 0
Cancelled (in usd per share) 25.53    
Unvested ending balance (in usd per share) $ 24.94 $ 33.37 $ 32.22