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Investment in Unconsolidated Joint Ventures - Investment (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) item property	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) item property	Sep. 30, 2019 USD ($) item	Dec. 31, 2019 USD ($) property	Mar. 31, 2021 USD ($)
Investment in Unconsolidated Joint Ventures
Number of joint ventures committed | property			2
Carrying Value	$ 7,069,000		$ 7,069,000		$ 19,003,000
Income Recognized			287,000	$ 1,973,000
Cash Interest Received			249,000	2,577,000
Liquidation proceeds			17,758,000	6,601,000
Joint Venture
Investment in Unconsolidated Joint Ventures
Liquidation proceeds	$ 17,758,000	$ 17,758,000
Additional proceeds						$ 729,000
Amount of gains (losses) on liquidation			$ (620,000,000)
Joint Venture | Preferred Equity Investment | Arizona
Investment in Unconsolidated Joint Ventures
Number of properties owned by joint venture | property	4		4
Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Capital Contributions			$ 6,398,000	394,000
Income Recognized			287,000	1,973,000
Cash Interest Received			249,000	2,577,000
Preferred Equity Investment | Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Investment commitment			13,000,000
Carrying Value	$ 6,340,000		6,340,000
Combination ILF, ALF and MC community | Preferred Equity Investment | Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Number of properties owned by joint venture for sale | property					4
Impairment loss from investments in unconsolidated joint ventures					$ 5,500,000
Combination ALF, MC, ILF | Preferred Equity Investment | Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Capital Contributions			58,000	394,000
Income Recognized			231,000	614,000
Cash Interest Received			$ 231,000	$ 1,166,000
Combination ALF, MC, ILF | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Arizona
Investment in Unconsolidated Joint Ventures
Preferred return percentage			15.00%
UDP | Preferred Equity Investment | Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Number of beds/units	95		95
Capital Contributions	$ 6,340,000		$ 6,340,000
Income Recognized			56,000
Cash Interest Received			$ 18,000
Combination ALF, ILF, MC | Mezzanine Loans | Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Preferred return percentage				15.00%
Number of beds/units | item				99
Investment commitment				$ 2,900,000
Income Recognized				955,000
Cash Interest Received				$ 979,000
Combination ALF/MC | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington
Investment in Unconsolidated Joint Ventures
Preferred return percentage			12.00%
Contractual cash portion			7.00%
Number of beds/units | item	95		95
Carrying Value	$ 6,340,000		$ 6,340,000
Percentage of Investment	15.50%		15.50%
Combination ALF/MC | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington | Internal Rate of Return is Until Eight Percent
Investment in Unconsolidated Joint Ventures
Percentage of cash return			8.00%
Combination ALF/MC | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington | Internal Rate of Return is Until Eight Percent | Minimum
Investment in Unconsolidated Joint Ventures
Percentage of cash return			7.00%
Combination ALF/MC | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington | Internal Rate of Return is Until Eight Percent | Maximum
Investment in Unconsolidated Joint Ventures
Percentage of cash return			9.00%
Combination ALF/MC | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington | The Internal Rate of Return is Between Twelve and Fourteen Percent | Minimum
Investment in Unconsolidated Joint Ventures
Percentage of cash return			12.00%
Combination ALF/MC | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington | The Internal Rate of Return is Between Twelve and Fourteen Percent | Maximum
Investment in Unconsolidated Joint Ventures
Percentage of cash return			14.00%
Combination ALF/MC | Mezzanine Loans | Joint Venture | Not primary beneficiary
Investment in Unconsolidated Joint Ventures
Preferred return percentage				15.00%
Number of beds/units | item				127
Investment commitment				$ 3,400,000
Income Recognized				404,000
Cash Interest Received				$ 432,000
Combination ILF/ALF | Preferred Equity Investment | Joint Venture | Not primary beneficiary | Washington
Investment in Unconsolidated Joint Ventures
Preferred return percentage			12.00%
Contractual cash portion			8.00%
Number of beds/units | item	267		267
Investment commitment			$ 13,000,000
Percentage of Investment	11.60%		11.60%
Percentage of cash return			8.00%
Percentage of internal rate of return			12.00%
Amount of joint venture investment	$ 13,000,000		$ 13,000,000

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