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Notes Receivable - Notes Receivable Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Notes receivable activities    
Advances under notes receivable $ 7,766  
Principal payments received under notes receivable (49) $ (2,352)
Reclassified to lease incentives (200)  
Notes receivable reserve 75 (24)
Total $ 7,442 $ (2,328)