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Notes Receivable - Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes Receivable      
Notes receivable $ 16,402 $ 16,427 $ 1,961
Notes receivable activities      
Advances and originations under notes receivable   14,969 1,554
Principal payments received under notes receivable (25) (100)  
Reclassified to real estate under development   (237) (1,035)
Notes Receivable reserve   (166)  
Net increase in notes receivable $ (25) $ 14,466 $ 519