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Loans Receivable and Investments (Narrative 2) (Details)
1 Months Ended 12 Months Ended
Oct. 28, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Sep. 30, 2016
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Proceeds from sale of loans       $ 309,000,000 $ 97,000,000    
Gain on repayment of loans receivable       9,600,000 1,900,000    
Investment in loans receivable and other       $ 158,635,000 $ 171,144,000 $ 498,992,000  
Debt instrument, face amount   $ 200,000,000          
Interest rate   1.132%          
Unsecured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans | loan         1    
Debt instrument, face amount         $ 20,000,000    
Secured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans | loan         1    
Debt instrument, face amount         $ 78,400,000    
Secured mortgage loans and other              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans sold | loan       3 3    
Investment in loans receivable and other   $ 140,000,000          
Secured loan, stated interest rate, percentage   9.95%          
Non-mortgage loans receivable, net              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans sold | loan       1 1    
Corporate Debt Securities              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Available-for-sale securities, amortized cost basis     $ 71,000,000        
Proceeds from sale of investment     $ 76,800,000        
Recognized gain on sale of investments         $ 5,800,000    
Unrealized gain on investment           $ 5,000,000  
Life Sciences Acquisitions | Non-mortgage loans receivable, net              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans | loan             3
LHP | Secured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, face amount $ 700,000,000            
Debt instrument, term of loan 5 years            
Interest rate 8.00%