Summary of Significant Accounting Policies (Narrative) (Details)		1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 01, 2019 USD ($) lease property	Mar. 31, 2020 USD ($)	Sep. 30, 2021 segment	Dec. 31, 2021 USD ($) segment lease property	Dec. 31, 2020 USD ($) lease segment	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)
Schedule of Shares Repurchased [Line Items]
Overstatement of previously recorded tax benefits, deferred tax assets and net income							$ 800,000	$ 300,000	$ 200,000
Interest expense				$ 47,900,000	$ 51,519,000	$ 56,059,000
Rent collection percentage				100.00%
Proceeds from government assistance				$ 5,100,000
Remaining lease term				4 years 10 months 24 days
Operating lease impairment loss				$ 1,100,000	2,700,000	$ 6,500,000
Assets held for sale				$ 0	$ 90,000
Number of reportable segments | segment			3	2	2	2
Money market funds				$ 0	$ 0
Cash and cash equivalents				59,738,000	72,357,000	$ 95,691,000
Cash in excess of FDIC limit				$ 46,200,000	$ 57,000,000
Number of senior housing communities | property				54
Number of intercompany leases modified | lease					25
Deferred tax asset, net				$ 4,200,000	$ 4,600,000
Effective income tax rate				0.00%	(105.80%)	26.40%
Number of properties receiving grants | property				4
Number of operating lease contracts | lease	11			7
Operating lease right-of-use assets				$ 7,914,000	$ 13,912,000
Operating lease liabilities				8,130,000	9,155,000
Operating lease costs				900,000	900,000	$ 1,000,000
Total present value of minimum lease payments				4,838,000
Domestic Tax Authority
Schedule of Shares Repurchased [Line Items]
Operating loss carryforwards				$ 13,300,000						$ 7,600,000
COVID19 Pandemic
Schedule of Shares Repurchased [Line Items]
Financial relief funds					3,600,000
Credit Facilities
Schedule of Shares Repurchased [Line Items]
Interest expense						0
Credit Facilities | Revision of Prior Period, Adjustment
Schedule of Shares Repurchased [Line Items]
Interest expense						300,000
Revolving Credit Facility | Credit Facilities
Schedule of Shares Repurchased [Line Items]
Line of credit facility		$ 95,000,000
Minimum
Schedule of Shares Repurchased [Line Items]
Lease intangibles, lease-up period				6 months
Maximum
Schedule of Shares Repurchased [Line Items]
Lease intangibles, lease-up period				24 months
Building
Schedule of Shares Repurchased [Line Items]
Useful life				40 years
Land Improvements
Schedule of Shares Repurchased [Line Items]
Useful life				15 years
Fixtures and improvements | Minimum
Schedule of Shares Repurchased [Line Items]
Useful life				7 years
Fixtures and improvements | Maximum
Schedule of Shares Repurchased [Line Items]
Useful life				10 years
Land and Building
Schedule of Shares Repurchased [Line Items]
Number of operating lease contracts | property	17
Accounting Standards Update 2016-02
Schedule of Shares Repurchased [Line Items]
Written off accounts receivable	$ 100,000
Straight-line rents receivable	100,000
Operating lease right-of-use assets	10,200,000
Operating lease liabilities	10,200,000
Operating lease costs	500,000
Total present value of minimum lease payments	$ 4,800,000
Seniors Housing Communities
Schedule of Shares Repurchased [Line Items]
Ancillary revenue				$ 3,500,000	$ 13,300,000	$ 15,400,000