Amount of current revolving borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

No definition available.

Debt (Narrative) (Details) $ in Thousands		1 Months Ended					3 Months Ended	12 Months Ended
Debt (Narrative) (Details) $ in Thousands	Mar. 31, 2022 USD ($) extensionOption	Jan. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Apr. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Mar. 31, 2015	Dec. 31, 2020 USD ($) numberOfProperty	Dec. 31, 2022 USD ($) loan facility property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($)	May 31, 2022 property	Mar. 30, 2022 USD ($)	Apr. 01, 2021	Jan. 01, 2021
Debt Instrument [Line Items]
Credit facility, current revolving borrowing capacity												$ 550,000
Prepayment fee for early retirement of debt								$ 0	$ (1,462)	$ (1,619)
Proceeds from issuance of senior notes								$ 0	$ 396,784	0
Debt leverage limit, coupon change, trigger								50.00%
Properties \| property								160
HUD mortgage loans, balance								$ 1,158,649
Less: discount								$ 2,600
Repayments of convertible debt				$ (67,100)
Debt instrument, convertible, liquidation preference, value				6,100
January 2023
Debt Instrument [Line Items]
Fixed Rate								3.99%
January 2023 \| Subsequent Event
Debt Instrument [Line Items]
Repayments of debt		$ 125,000
Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate								1.00%
Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate								0.50%
Unsecured Debt \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 700,000		$ 700,000
Debt instrument, number of extension options \| extensionOption	2
Debt instrument, extension period	6 months
Debt issuance costs, gross								$ 4,500
Basis point floor	0.10%		0.10%						0.10%
Revolving facility fee percentage								0.25%
Unsecured Debt \| Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate								1.05%
Adjusts basis spread on variable rate								1.25%
Line of credit facility, interest rate at period end								4.36%
$300M Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 300,000		$ 300,000
Repayments of debt								$ 60,000
$75M Term Loan
Debt Instrument [Line Items]
Repayments of debt			$ 75,000
$100M Term Loan
Debt Instrument [Line Items]
Term loans, outstanding balance					$ 100,000
Basis spread on variable rate					1.85%
Basis point floor	1.35%		1.35%											0.50%
Prepayment fee for early retirement of debt								(200)	$ (1,900)
Deferred debt issuance cost									500
Debt Instrument, Name, Revolving Credit Facility
Debt Instrument [Line Items]
Unused balance of the unsecured revolving credit facility								658,000
Senior notes - unsecured, net of discount of $2,600 and $2,921
Debt Instrument [Line Items]
Less: discount								2,600	$ 2,921
Senior notes - unsecured, net of discount of $2,600 and $2,921 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount, senior notes					$ 400,000
Fixed Rate					3.00%
Percentage of issue price on face value					0.99196%
Proceeds from issuance of senior notes					$ 392,300
Fannie Mae Term Loans
Debt Instrument [Line Items]
Long-term debt								60,100
Fannie Mae term loans - secured, non-recourse
Debt Instrument [Line Items]
Prepayment fee for early retirement of debt								$ (1,500)
Fixed Rate						3.79%
Debt instrument, term						10 years
Number of Fannie Mae term loans \| loan								2
Fannie Mae term loans, balance								$ 17,900
Fannie Mae term loans, accrued interest								100
Net book value of real estate pledged toward mortgage								$ 104,300
FNMA Berkadia Note
Debt Instrument [Line Items]
Fixed Rate								4.60%
Fannie Mae financing								$ 16,500
Debt Instrument, Name, HUD Mortgages
Debt Instrument [Line Items]
Prepayment fee for early retirement of debt							$ (1,600)
Fannie Mae term loans, accrued interest							$ 200
Number of mortgage loans \| numberOfProperty							10
HUD mortgage loans, balance							$ 42,600			42,600
Less: discount							1,200			1,200
Deferred financing costs							$ 1,100			$ 1,100
Debt Instrument, Name, Convertible Senior Notes
Debt Instrument [Line Items]
Fixed Rate													3.25%
Fannie Mae term loans, accrued interest				$ 1,000
Bickford Senior Living
Debt Instrument [Line Items]
Properties								36			3
Bickford Senior Living \| Fannie Mae term loans - secured, non-recourse
Debt Instrument [Line Items]
Properties \| property									11
Minimum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage								0.125%
Minimum \| Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate								0.725%
Minimum \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate								0.00%
Maximum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage								0.30%
Maximum \| Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate								1.40%
Maximum \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate								0.40%
Interest Rate Swaps, Maturity Date, After June 2020
Debt Instrument [Line Items]
Derivative, notional amount									$ 400,000
Fixed Rate									1.92%