Real Estate Assets - Purchase Price Allocation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition
Land	$ 551,378,000	$ 605,282,000
Less: accumulated depreciation	(578,496,000)	(509,547,000)
Building and improvements	2,671,535,000	3,034,727,000
Furniture, fixtures, and equipment	359,743,000	306,725,000
Construction in progress	5,151,000	12,269,000
Real Estate Investment Property, at Cost	3,707,138,000	4,143,291,000
Tenant Improvements	119,331,000	184,288,000
Revenues	451,142,000	501,185,000	$ 470,427,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	20,532,000	(181,603,000)	$ (7,458,000)
Multifamily Acquisitions [Member]
Business Acquisition
Land	27,639,000	28,074,000
Building and improvements	250,833,000	194,434,000
Furniture, fixtures, and equipment	51,628,000	50,170,000
business combinations, accrued property tax liability	(1,464,000)	(437,000)
Business Combination, Consideration Transferred	335,166,000	280,488,000
Payments to Acquire Businesses, Gross	89,335,000	144,016,000
Other liabilities	(831,000)	(742,000)
capitalized acquisition costs asset acquisition	$ 1,018,000	$ 4,370,000
Finite-Lived Intangible Assets, Remaining Amortization Period	7 years 1 month 6 days	0 years
Amortization	$ 6,989,000	$ 8,635,000
business combination prepaids and other assets acquired	372,000	354,000
business combination debt financing	245,831,000	136,472,000
Multifamily Acquisitions 2021
Business Acquisition
Revenues	8,847,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(5,387,000)
Multifamily Acquisitions 2020
Business Acquisition
Revenues	25,162,000	9,328,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (7,656,000)	$ (6,244,000)