Shareholders' Equity - Schedule of Declared Distributions (Details) - 6.50% Series D Cumulative Convertible Preferred Shares of Beneficial Interest - $ / shares	May 15, 2020	Apr. 09, 2020	Feb. 18, 2020	Jan. 10, 2020
Class of Stock [Line Items]
Dividend declared (in dollars per share)				$ 0.40625
Dividend paid (in dollars per share)			$ 0.40625
Scenario, Forecast
Class of Stock [Line Items]
Dividend paid (in dollars per share)	$ 0.40625
Subsequent event
Class of Stock [Line Items]
Dividend declared (in dollars per share)		$ 0.40625