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Share-Based Compensation Plan - Service Condition Restricted Share Activity (Details) - Service Condition Share Awards - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares      
Unvested beginning balance (in shares) 242,727 149,179 127,732
Granted (in shares) 415,531 390,242 88,430
Vested (in shares) (81,591) (72,824) (66,276)
Forfeited (in shares) (9,236) (6,787) (707)
Cancelled (in shares)   (217,083)  
Unvested ending balance (in shares) 567,431 242,727 149,179
Weighted-Average Grant Date Fair Value      
Unvested beginning balance (in usd per share) $ 24.94 $ 33.37 $ 32.22
Granted (in usd per share) 22.69 23.62 32.64
Vested (in usd per share) 30.41 33.13 30.20
Forfeited (in usd per share) 23.37 27.68 32.70
Cancelled (in usd per share)   25.53  
Unvested ending balance (in usd per share) $ 22.53 $ 24.94 $ 33.37