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Notes Receivable - Other Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]      
Advances under notes receivable $ 124   $ 14,969
Principal payments received under notes receivable (3,848) $ (25) (100)
Reclassified to real estate under development     (237)
Notes Receivable reserve 37   (166)
Net (decrease) increase in notes receivable $ (3,687) $ (25) $ 14,466