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Debt (Narrative) (Details)
numberOfBedOrUnitInTheProperty in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
shares
Dec. 31, 2021
USD ($)
numberOfLoan
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Jan. 22, 2022
USD ($)
Dec. 31, 2021
numberOfProperty
Dec. 31, 2021
numberOfBedOrUnitInTheProperty
Dec. 31, 2021
Nov. 02, 2020
USD ($)
Debt Instrument [Line Items]                  
Debt Leverage Limit, Coupon Change, Trigger   50.00%              
Unsecured Debt   $ 400,000,000              
Convertible Debt   0 $ 60,000,000            
Credit Facility, Current Revolving Borrowing Capacity   550,000,000              
Repayments of Convertible Debt   (67,100,000)   $ (60,300,000)          
Payments for Repurchase of Redeemable Convertible Preferred Stock   $ 73,100,000              
Stock Issued During Period, Shares, New Issues | shares   661,951 535,990            
Convertible Debt, Fair Value Disclosures   $ 51,000,000              
Loss on extinguishment of debt   $ (1,912,000) $ (3,924,000) $ (823,000)          
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares   10,453 0 210,224          
Derivative, Fair Value, Net     $ (7,100,000)            
Debt Instrument, Variable Rate Basis, Minimum     1400.00%         1000.00%  
Long-term Line of Credit   $ 0 $ 298,000,000            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25%              
Number of Real Estate Properties | numberOfProperty           198      
Proceeds from Issuance of Senior Long-term Debt   $ 396,784,000 0 $ 0          
Long-term Debt, Gross   1,249,117,000              
Payment for Debt Extinguishment or Debt Prepayment Cost   1,462,000 1,619,000 $ 0          
Debt Instrument, Convertible, Liquidation Preference, Value   6,100,000              
Asset Held For Sale [Member]                  
Debt Instrument [Line Items]                  
Number of Real Estate Properties | numberOfProperty           10      
Subsequent Event [Member] | Letter of Credit                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         $ 345,000,000        
Number of Banks         3        
$250M Term Loan [Member]                  
Debt Instrument [Line Items]                  
Term Loans, Outstanding Balance   75,000,000              
$300M Term Loan [Member]                  
Debt Instrument [Line Items]                  
Term Loans, Outstanding Balance   300,000,000              
Bank Term Loans [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt   $ 375,000,000 $ 650,000,000            
Debt Instrument, Basis Spread on Variable Rate   1.27%              
Debt Instrument, Name, Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   1.20%              
Unused balance of the unsecured revolving credit facility   $ 550,000,000              
Debt Instrument, Name, HUD Mortgages [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Increase, Accrued Interest   200,000              
Long-term Debt, Gross                 $ 42,600,000
Payment for Debt Extinguishment or Debt Prepayment Cost   1,600,000              
Debt Instrument, Unamortized Discount   1,200,000              
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Gross   $ 1,100,000              
Debt Instrument, Name, Fannie Mae Term Loans [Member]                  
Debt Instrument [Line Items]                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Number of Loans | numberOfLoan   2              
Debt Instrument, Term   10 years              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages   $ 78,100,000              
Debt Instrument, Interest Rate, Stated Percentage               3.79%  
Number of Real Estate Properties | numberOfProperty           12      
Net Book Value of Real Estate Pledged Toward Mortgage   110,500,000              
Debt Instrument, Increase, Accrued Interest   100,000              
Payment for Debt Extinguishment or Debt Prepayment Cost   1,500,000              
Early Repayment of Senior Debt   17,900,000              
Debt Instrument, Name, Fannie Mae Term Loans [Member] | Asset Held For Sale [Member]                  
Debt Instrument [Line Items]                  
Number of Real Estate Properties | numberOfProperty           1      
FNMA Berkadia Note [Member]                  
Debt Instrument [Line Items]                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages   $ 16,900,000              
Debt Instrument, Interest Rate, Stated Percentage               4.60%  
$100M Term Loan [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   1.85%              
Debt Instrument, Variable Rate Basis, Minimum               0.50%  
Term Loans, Outstanding Balance   $ 100,000,000              
Payment for Debt Extinguishment or Debt Prepayment Cost   1,900,000              
At Inception [Member]                  
Debt Instrument [Line Items]                  
Convertible Debt   120,000,000              
Debt Instrument, Name, Convertible Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature   12,800,000              
Debt Instrument, Interest Rate, Stated Percentage               3.25%  
Debt Instrument, Increase, Accrued Interest   1,000,000              
Principal Amount [Member]                  
Debt Instrument [Line Items]                  
Convertible Debt   60,000,000              
Senior Notes Dues 2031 [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt   397,079,000              
Debt Instrument, Unamortized Discount   2,921,000              
Senior Notes Dues 2031 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage               3.00%  
Debt Instrument, Face Amount   400,000,000              
Proceeds from Issuance of Senior Long-term Debt   392,300,000              
Percentage Of Issue Price On Face Value               0.99196%  
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Maturity, Renewal Fee             0.6 10  
Bickford Senior Living [Member]                  
Debt Instrument [Line Items]                  
Number of Real Estate Properties | numberOfProperty           38      
Bickford Senior Living [Member] | Asset Held For Sale [Member]                  
Debt Instrument [Line Items]                  
Number of Real Estate Properties | numberOfProperty           4      
Bickford Senior Living [Member] | Debt Instrument, Name, Fannie Mae Term Loans [Member]                  
Debt Instrument [Line Items]                  
Number of Real Estate Properties               11  
November 2025 [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt   50,000,000              
Debt Instrument, Interest Rate, Stated Percentage               4.33%  
January 2023 [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt   125,000,000              
Debt Instrument, Interest Rate, Stated Percentage               3.99%  
Cash Paid [Member]                  
Debt Instrument [Line Items]                  
Repayments of Convertible Debt   $ (22,100,000)              
Common Stock [Member]                  
Debt Instrument [Line Items]                  
Stock Issued During Period, Shares, New Issues | shares       1,209,522          
Convertible Debt [Member] | Common Stock [Member]                  
Debt Instrument [Line Items]                  
Stock Issued During Period, Shares, New Issues | shares 626,397 626,397              
Interest Rate Swap(s), Date Entered, March & June 2019 [Member] | Bank Term Loans [Member]                  
Debt Instrument [Line Items]                  
Derivative, Notional Amount   $ 400,000,000              
Interest Rate Swaps, Maturity Date, After June 2020 [Member]                  
Debt Instrument [Line Items]                  
Derivative, Notional Amount   400,000,000              
Interest rate swaps, Matured June 2020 [Member]                  
Debt Instrument [Line Items]                  
Derivative, Notional Amount   $ 210,000,000