Lease Incentives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Lease Incentives
Non-contingent lease incentives	$ 2,401		$ 2,401		$ 2,552
Non-contingent lease incentives, funding			50	$ 322
Non-contingent lease incentives, Amortization	$ (108)	$ (100)	(317)	(281)
Non-contingent lease incentives, Adjustment			115	(11,893)
Reclassified to lease incentives			300	200
Non-contingent lease incentives, Write off			$ 185	$ (12,093)