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Recent Events and Accounting Pronouncements (Details) - USD ($)				1 Months Ended	7 Months Ended	9 Months Ended
	Aug. 20, 2020	May 21, 2020	Feb. 20, 2020	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Indebtedness
Dividend per share (in dollars per share)	$ 0.01	$ 0.01	$ 0.15	$ 0.01	$ 0.01
Aggregate sales price						$ 78,244,000	$ 50,355,000
Term loan due 2022
Indebtedness
Debt face amount				$ 200,000,000	$ 200,000,000	200,000,000
Senior Unsecured Note Due March 2025
Indebtedness
Debt face amount				1,000,000,000	1,000,000,000	1,000,000,000
Unsecured revolving credit facility
Indebtedness
Unsecured revolving credit facility, maximum borrowing capacity				1,000,000,000	1,000,000,000	$ 1,000,000,000
Aggregate sales price					120,776,000
Sales price, agreement to sell					$ 167,392,000
Unrestricted cash or undrawn availability				$ 200,000,000

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