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Preferred Equity and Mezzanine Loan Investments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Variable Interest Entity [Line Items] |  |
Total | $ 154,006 | $ 138,920
New York |  |
Variable Interest Entity [Line Items] |  |
Geographic concentration, percent | 22.00% | 24.10%
Texas |  |
Variable Interest Entity [Line Items] |  |
Geographic concentration, percent | 21.70% | 24.30%
Florida |  |
Variable Interest Entity [Line Items] |  |
Geographic concentration, percent | 15.30% | 3.90%
Virginia |  |
Variable Interest Entity [Line Items] |  |
Geographic concentration, percent | 9.80% | 10.80%
Alabama |  |
Variable Interest Entity [Line Items] |  |
Geographic concentration, percent | 6.50% | 7.10%
South Carolina |  |
Variable Interest Entity [Line Items] |  |
Geographic concentration, percent | 6.40% | 7.00%
Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Investment amount | $ 155,604 | $ 140,560
Deferred loan fees, net | (1,598) | (1,640)
Total | $ 154,006 | $ 138,920
Number of delinquent loans | loan | 0 | 0

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