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Notes Receivable - Notes Receivable Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Notes receivable activities    
Advances under notes receivable $ 1,811 $ 611
Principal payments received under notes receivable (2,553) (2,163)
Reclassified to lease incentives   (300)
Notes receivable reserve 7 18
Net decrease $ (735) $ (1,834)