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Real Estate Debt Investments - Narrative (Details)
6 Months Ended
Jun. 30, 2016
Investment
Mortgage Loans on Real Estate [Abstract]  
Weighted average period of contractual maturity, including extensions 3 years 7 months 16 days
Number of days past contractual debt service payments loan categorized as a weaker credit quality debt investment 90 days
Number of loans contributing to more than 10% of interest income 3
Percent of interest income contributed by investment (more than) 10.00%
Debt Investments | Credit Concentration Risk  
Concentration Risk [Line Items]  
Percentage of total debt investments 53.70%