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% |