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Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
properties
shares
number_of_loans
$ / shares
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
Debt Instrument, Unamortized Discount $ (2,497,000)    
Derivative, Fair Value, Net 339,000   $ 1,297,000
Repayments of Convertible Debt 0 $ 29,958,000  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 881,000    
Debt Instrument, Convertible, Conversion Ratio 14.47    
Debt Instrument, Convertible, Conversion Price | $ / shares $ 69.11    
Debt Instrument, Convertible, If-converted Value in Excess of Principal $ 16,390,000    
Debt Instrument, Convertible, Number of Equity Instruments | shares 1,736,340    
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares 223,513 0  
Convertible Debt $ 118,802,000   $ 118,609,000
Payments of Debt Issuance Costs 67,000 $ 0  
Gain (Loss) on Extinguishment of Debt $ 0 $ (738,000)  
Debt Instrument, Variable Rate Basis, Minimum 24945.00%   25026.90%
Portion of Debt Instrument Not Fixed with Interest Rate Derivative $ 100,000,000    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 2000.00%    
Credit Facility, Current Revolving Borrowing Capacity     $ 550,000,000
Number of Real Estate Properties | properties 220    
Debt Instrument, Name, Q3 2014 HUD Mortgages [Member]      
Debt Instrument, Unamortized Discount $ (1,299,000)   (1,320,000)
$250M Term Loan [Member]      
Term Loans, Outstanding Balance 250,000,000    
$300M Term Loan [Member]      
Term Loans, Outstanding Balance $ 300,000,000    
Bank Term Loans [Member]      
Debt Instrument, Basis Spread on Variable Rate 12700.00%    
Debt Instrument, Name, Convertible Senior Notes [Member]      
Debt Instrument, Unamortized Discount $ (1,199,000)   $ (1,391,000)
Debt Instrument, Interest Rate, Stated Percentage 3.25%    
Convertible Debt Instrument, Conversion Ratio, Principal Amount, Basis $ 1,000    
At Inception [Member]      
Proceeds from convertible senior notes $ 200,000,000    
Debt Instrument, Convertible, Conversion Ratio 13.93    
Debt Instrument, Convertible, Conversion Price | $ / shares $ 71.81    
Debt Instrument, Convertible, Number of Equity Instruments | shares 2,785,200    
Debt Instrument, Name, Revolving Credit Facility [Member]      
Debt Instrument, Basis Spread on Variable Rate 11500.00%    
Unused balance of the unsecured revolving credit facility $ 461,000,000    
FNMA Berkadia Note [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages $ 17,874,000    
Debt Instrument, Interest Rate, Stated Percentage 4.60%    
Debt Instrument, Name, Fannie Mae Term Loans [Member]      
Debt Instrument, Term 10 years    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages $ 78,084,000    
Debt Instrument, Interest Rate, Stated Percentage 3.79%    
Number of Real Estate Properties 13    
Net Book Value of Real Estate Pledged Toward Mortgage $ 137,416,000    
Debt Instrument, Name, HUD Mortgages [Member]      
Number of Real Estate Properties | properties 10    
Net Book Value of Real Estate Pledged Toward Mortgage $ 50,437,000    
Debt Instrument, Name, HUD Mortgages [Member] | Minimum [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate 4.30%    
Debt Instrument, Name, HUD Mortgages [Member] | Maximum [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate     4.40%
Debt Instrument, HUD Mortgages, 2049 Maturity [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Number of Loans | number_of_loans 9    
Debt Instrument, HUD Mortgages, 2047 Maturity [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Number of Loans | number_of_loans 1    
Bickford Senior Living [Member]      
Number of Real Estate Properties | properties 50    
Middletown, OH [Member] | Bickford Senior Living [Member]      
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Rate 2.90%    
Noncash or Part Noncash Acquisition, Debt Assumed $ 8,652,000    
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed 7,353,000    
Fair Value, Inputs, Level 2 [Member]      
Cash Flow Hedge Derivative Instrument Assets at Fair Value 559,000   $ 1,297,000
Interest Rate Swap, Date Entered, March 2019 [Member]      
Derivative, Notional Amount $ 200,000,000