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Share-Based Compensation Plan - Service Condition Restricted Share Activity (Details) - Restricted common shares
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Shares  
Unvested beginning balance (in shares) | shares 149,179
Granted (in shares) | shares 332,920
Vested (in shares) | shares (72,824)
Forfeited (in shares) | shares (5,429)
Cancelled (in shares) | shares (217,083)
Unvested ending balance (in shares) | shares 186,763
Weighted-Average Grant Date Fair Value  
Unvested beginning balance (in usd per share) | $ / shares $ 33.37
Granted (in usd per share) | $ / shares 25.53
Vested (in usd per share) | $ / shares 33.13
Forfeited (in usd per share) | $ / shares 27.41
Cancelled (in usd per share) | $ / shares 25.53
Unvested ending balance (in usd per share) | $ / shares $ 28.77