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Notes Receivable - Notes Receivable Activity (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Notes receivable activities    
Advances under notes receivable $ 8,531 $ 50
Principal payments received under notes receivable (3,446) (3,848)
Reclassified to lease incentives (200)  
Notes receivable reserve 48 (38)
Total $ 4,837 $ (3,760)