XML 59 R46.htm IDEA: XBRL DOCUMENT v3.19.1
Real Estate Debt Investments - Narrative (Details) - Investment
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]    
Number of debt instruments 1 1
Number of days past contractual debt service payments loan categorized as a weaker credit quality debt investment 90 days  
Percent of interest income contributed by investment 100.00%