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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Non-cash investing and financing transactions:      
Reclassification of notes receivable to lease incentives (Note 7) $ 200    
Restricted stock issued, net of cancellations (Note 10)   $ 1 $ 1