Segment Reporting - Segment Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information, Additional Information
Total assets	[1]	$ 2,142,869	$ 2,358,918
Operating Segments | Net Lease
Segment Reporting Information, Additional Information
Total assets		1,586,662	1,688,259
Operating Segments | Self Storage
Segment Reporting Information, Additional Information
Total assets		337,052	345,936
Operating Segments | Other Operating Properties
Segment Reporting Information, Additional Information
Total assets		160,746	258,017
Corporate
Segment Reporting Information, Additional Information
Total assets		30,409	38,697
All Other
Segment Reporting Information, Additional Information
Total assets		$ 28,000	$ 28,009

[1] See Note 2 for details related to variable interest entities (“VIEs”).