Lease Incentives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lease Incentives
Non-contingent lease incentives	$ 2,590		$ 2,590		$ 14,443
Non-contingent lease incentives, funding			322	$ 1,272
Total funding			322	1,272
Non-contingent lease incentives, Amortization			(281)	(1,292)
Contingent lease incentives, Amortization				(359)
Total amortization	$ (100)	$ (560)	(281)	$ (1,651)
Non-contingent lease incentives, Adjustment			(11,893)
Total Adjustment			(11,893)
Contingent lease incentives, Write off					$ 12,093
Reclassification of Notes Receivable to Lease Incentives			$ 200