Lease Incentives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Lease Incentives
Non-contingent lease incentives	$ 2,726		$ 2,462
Non-contingent lease incentives, funding	650	$ 50
Non-contingent lease incentives, Amortization	$ (386)	(317)
Lease adjustment		115
Reclassified to lease incentives		300
Non-contingent lease incentives, Write off		$ 185