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Lease Incentives (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lease Incentives      
Non-contingent lease incentives $ 2,414   $ 2,462
Non-contingent lease incentives, funding 180 $ 13  
Non-contingent lease incentives, Amortization $ (228) (209)  
Lease adjustment   115  
Reclassified to lease incentives   300  
Non-contingent lease incentives, Write off   $ 185