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Loan Participations Payable, net (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Loan Participations Payable, net [Line Items]    
Unfunded commitments $ 840,198,000  
Loans receivable, net 1,590,676,000 $ 1,539,696,000
Loan participations payable, net 154,111,000 152,086,000
Loan Participations Payable    
Loan Participations Payable, net [Line Items]    
Loan participations payable, net 154,100,000 152,100,000
Loan Participation Payable One    
Loan Participations Payable, net [Line Items]    
Loan participations payable, carrying amount   100,000,000.0
Loans receivable, commitments   250,000,000.0
Loans receivable, funded commitment   38,900,000
Proceeds from loan participations payable   38,900,000
Unfunded commitments   $ 61,100,000
Loans receivable with fixed rates of interest   5.90%
Loans receivable, amount funded to borrower 1,900,000  
Loans receivable, net $ 54,900,000  
Loan Participation Payable Two    
Loan Participations Payable, net [Line Items]    
Loan participations payable, carrying amount   $ 100,000,000.0
Loans receivable, commitments   220,200,000
Loans receivable, funded commitment   100,000,000.0
Proceeds from loan participations payable   99,200,000
Description of variable rate basis LIBOR  
Basis spread on variable rate 3.50%  
Loan Participation Payable Two | Minimum    
Loan Participations Payable, net [Line Items]    
Debt instrument, basis spread on variable rate 0.25%  
Loan Participations Payable    
Loan Participations Payable, net [Line Items]    
Loans receivable, net $ 154,900,000 $ 153,000,000