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Notes Receivable - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Notes receivable activities    
Notes receivable reserve $ (128) $ (166)
Total 12,715 16,402
Mezzanine loans    
Notes receivable activities    
Financing Receivable, Gross 9,868 13,700
Other loans    
Notes receivable activities    
Financing Receivable, Gross $ 2,975 $ 2,868