Segment Reporting (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020 property segment	Mar. 31, 2019 segment	Mar. 31, 2020 encumbered_property
Segment Reporting [Abstract]
Number of reportable segments | segment	3	3
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties	200		113
NuVista Tenants
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties	2
Transition Property | NuVista Tenants
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Number of properties	1