Dividends and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended						2 Months Ended					3 Months Ended					9 Months Ended		11 Months Ended
	May 31, 2020	Mar. 31, 2020	Dec. 31, 2019	May 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Oct. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2019	Jan. 31, 2019	Sep. 30, 2020	Jul. 31, 2020	Oct. 31, 2019	Sep. 30, 2019	Jul. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 31, 2020	Oct. 31, 2019
Dividends Payable [Line Items]
Dividend Per Share (in USD per share)								$ 0.2100	$ 0.2000	$ 0.2000	$ 0.1875	$ 0.21	$ 0.2100	$ 0.2000	$ 0.20	$ 0.2000	$ 0.63	$ 0.60
Common Shares
Distributions Declared								$ 42,568	$ 0	$ 30,235	$ 0		$ 43,271	$ 38,795		$ 38,764				$ 107,794
Distributions Paid								42,568	38,796	30,235	28,218		43,271	$ 0		38,764				$ 96,811
Dividend equivalents accrued on unvested restricted stock units to be paid when the awards vest.
Common Shares
Distributions Paid	$ 232	$ 233	$ 169	$ 172	$ 142	$ 127
Dividend equivalents paid on unvested restricted stock units that are not expected to vest (recognized as additional compensation).
Common Shares
Distributions Paid								$ 10	$ 4	$ 15	$ 7		$ 10			$ 13
Subsequent Event
Dividends Payable [Line Items]
Dividend Per Share (in USD per share)							$ 0.2100
Common Shares
Distributions Declared							$ 43,282												$ 129,121
Distributions Paid							$ 0												$ 124,025