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Notes Receivable - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Notes Receivable    
Notes receivable reserve $ (166) $ (166)
Notes receivable, total 16,402 16,402
Mezzanine loans    
Notes Receivable    
Notes receivable, gross 13,700 13,700
Other loans    
Notes Receivable    
Notes receivable, gross $ 2,868 $ 2,868