Share Incentive Plans - Summary of Terms of Awards Generally Granted to Employees (Details)	12 Months Ended
	Dec. 31, 2020
Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Overview	Options exercised after vesting result in issuance of new Common Shares.
Grant/Exercise Price	Granted at the fair market value of Common Shares as of the grant date.
Vesting Period	3 years
Expiration	10 years
Upon Employee Termination	Unvested options are canceled.
Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Overview	Restricted shareholders generally have the same voting rights and receive quarterly dividend payments on their shares at the same rate and on the same date as any other Common Share holder (1).
Grant/Exercise Price	Granted at the fair market value of Common Shares as of the grant date.
Vesting Period	3 years
Upon Employee Termination	Unvested restricted shares are canceled.
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Overview	When certain conditions are met, restricted units convert into an equal number of OP Units, which the holder may exchange for Common Shares on a one-for-one basis or at the option of the Company the cash value of such shares. Restricted unitholders receive quarterly distribution payments on their restricted units at the same rate and on the same date as any other OP Unit holder (1).
Grant/Exercise Price	Granted at varying discount rates to the fair market value of Common Shares as of the grant date (2).
Vesting Period	3 years
Expiration	10 years
Upon Employee Termination	Unvested restricted units are canceled.