Lease Incentives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lease Incentives
Non-contingent lease incentives	$ 2,471		$ 2,471		$ 2,552
Non-contingent lease incentives, funding			13	$ 283
Non-contingent lease incentives, Amortization	$ (108)	$ (94)	(209)	(181)
Reclassification of Notes Receivable to Lease Incentives			300	200
Adjustment			115	(11,893)
Non-contingent lease incentives, Write off			$ 185	$ (12,093)