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Share Incentive and Other Compensation - Employee Share Purchase Plan and Deferred Share Plan - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee share purchase discount rate	15.00%
Employee share purchase maximum purchase amount	$ 25,000
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee share purchase (in shares)	2,320	3,495

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Employee stock ownership plan allowable share purchase amount per annum maximum.

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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