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Debt (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
properties
shares
number_of_loans
$ / shares
Mar. 31, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Mar. 31, 2014
USD ($)
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed $ 824,000 $ 450,000    
Proceeds from convertible senior notes 200,000,000      
Line of Credit Facility, Maximum Borrowing Capacity $ 800,000,000      
Debt Instrument, Convertible, Conversion Ratio 14.13      
Convertible Debt Instrument, Conversion Ratio, Principal Amount, Basis $ 1,000      
Debt Instrument, Convertible, Conversion Price | $ / shares $ 70.75      
Debt Instrument, Convertible, If-converted Value in Excess of Principal $ 5,302,000      
Debt Instrument, Convertible, Number of Equity Instruments | shares 2,826,680      
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares 98,048 0    
Convertible Debt $ 195,577,000   $ 195,283,000 $ 192,238,000
Debt Instrument, Convertible, Carrying Amount of Equity Component       $ 7,762,000
Debt Instrument, Interest Rate, Effective Percentage 3.90%      
Unamortized Debt Issuance Expense $ 9,149,000   $ 9,740,000  
Debt Instrument, Variable Interest Rate, Reference Rate, Basis Points 9800.00%      
Credit Facility, Current Revolving Borrowing Capacity $ 550,000,000      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 4000.00%      
Number of Real Estate Properties | properties 206      
Debt Instrument, Name, Convertible Senior Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage 3.25%      
Debt Issuance Cost $ 6,063,000      
Unamortized Debt Issuance Expense $ 3,003,000      
Debt Instrument, Name, Revolving Credit Facility [Member]        
Debt Maturity, Extension Option, Number Of Years 1 year      
Debt Instrument, Basis Spread on Variable Rate 15000.00%      
Unused balance of the unsecured revolving credit facility $ 363,000,000      
Debt Instrument Name, $130m Term Loan - June 2020 Maturity [Member]        
Term Loans, Outstanding Balance $ 130,000,000      
Debt Instrument, Basis Spread on Variable Rate 17500.00%      
Debt Instrument Name, $120m Term Loans - June 2020 Maturity [Member]        
Term Loans, Outstanding Balance $ 120,000,000      
Debt Instrument, Basis Spread on Variable Rate 17500.00%      
Number of Term Loans 2      
Debt Instrument, Name, Fannie Mae Term Loans [Member]        
Debt Instrument, Term 10 years      
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 $ 110,252,000      
Debt Instrument, Name, HUD Mortgages [Member]        
Number of Real Estate Properties | properties 10      
Net Book Value of Real Estate Pledged Toward Mortgage $ 53,882,000      
Debt Instrument, Name, HUD Mortgages [Member] | Minimum [Member]        
Mortgage Loans on Real Estate, Interest Rate 4.30%      
Debt Instrument, Name, HUD Mortgages [Member] | Maximum [Member]        
Mortgage Loans on Real Estate, Interest Rate 4.40%      
Debt Instrument, HUD Mortgages, 2049 Maturity [Member]        
Mortgage Loans on Real Estate, Number of Loans | number_of_loans 9      
Debt Instrument, HUD Mortgages, 2047 Maturity [Member]        
Mortgage Loans on Real Estate, Number of Loans | number_of_loans 1      
Allocated to Debt [Member] | Debt Instrument, Name, Convertible Senior Notes [Member]        
Debt Issuance Cost $ 5,788,000      
Allocated to Equity [Member] | Debt Instrument, Name, Convertible Senior Notes [Member]        
Debt Issuance Cost $ 275,000      
Bickford Senior Living [Member]        
Number of Real Estate Properties | properties 42      
Middletown, OH [Member] | Bickford Senior Living [Member]        
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed $ 7,598,000      
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Rate 2.90%      
Noncash or Part Noncash Acquisition, Debt Assumed $ 9,063,000