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Notes Receivable - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Notes receivable activities    
Notes receivable reserve $ (198) $ (128)
Total 19,558 12,715
Mezzanine loans    
Notes receivable activities    
Financing Receivable, Gross 16,700 9,868
Other loans    
Notes receivable activities    
Financing Receivable, Gross $ 3,056 $ 2,975