Revenue from Contracts with Customers (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) noteReceivable	Dec. 31, 2020 USD ($)
Revenue from Contracts with Customers
Gain on sale of leased equipment	$ 5,975	$ 3,391
Gain on sale of financial assets	10,874	0
Revenue	$ 274,202	288,692
Number notes receivable sold | noteReceivable	2
Lease rent revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	$ 134,831	142,895
Maintenance reserve revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	73,961	105,365
Spare parts and equipment sales
Revenue from Contracts with Customers
Other sales and revenues	17,417	18,625
Asset transition fee
Revenue from Contracts with Customers
Other sales and revenues	6,256	0
Managed services
Revenue from Contracts with Customers
Other sales and revenues	11,434	8,753
Other revenue
Revenue from Contracts with Customers
Other sales and revenues	13,454	9,663
Operating Segments | Leasing and  Related Operations
Revenue from Contracts with Customers
Gain on sale of leased equipment	5,975	3,391
Gain on sale of financial assets	10,874
Revenue	256,784	271,569
Operating Segments | Leasing and  Related Operations | Lease rent revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	134,831	142,895
Operating Segments | Leasing and  Related Operations | Maintenance reserve revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	73,961	105,365
Operating Segments | Leasing and  Related Operations | Spare parts and equipment sales
Revenue from Contracts with Customers
Other sales and revenues	365	1,514
Operating Segments | Leasing and  Related Operations | Asset transition fee
Revenue from Contracts with Customers
Other sales and revenues	6,256
Operating Segments | Leasing and  Related Operations | Managed services
Revenue from Contracts with Customers
Other sales and revenues	11,434	8,753
Operating Segments | Leasing and  Related Operations | Other revenue
Revenue from Contracts with Customers
Other sales and revenues	13,088	9,651
Operating Segments | Spare Parts Sales
Revenue from Contracts with Customers
Gain on sale of leased equipment	0	0
Gain on sale of financial assets	0
Revenue	17,565	17,841
Operating Segments | Spare Parts Sales | Lease rent revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	0	0
Operating Segments | Spare Parts Sales | Maintenance reserve revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	0	0
Operating Segments | Spare Parts Sales | Spare parts and equipment sales
Revenue from Contracts with Customers
Other sales and revenues	17,042	17,514
Operating Segments | Spare Parts Sales | Asset transition fee
Revenue from Contracts with Customers
Other sales and revenues	0
Operating Segments | Spare Parts Sales | Managed services
Revenue from Contracts with Customers
Other sales and revenues	0	0
Operating Segments | Spare Parts Sales | Other revenue
Revenue from Contracts with Customers
Other sales and revenues	523	327
Eliminations
Revenue from Contracts with Customers
Gain on sale of leased equipment	0	0
Gain on sale of financial assets	0
Revenue	(147)	(718)
Eliminations | Lease rent revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	0	0
Eliminations | Maintenance reserve revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue	0	0
Eliminations | Spare parts and equipment sales
Revenue from Contracts with Customers
Other sales and revenues	10	(403)
Eliminations | Asset transition fee
Revenue from Contracts with Customers
Other sales and revenues	0
Eliminations | Managed services
Revenue from Contracts with Customers
Other sales and revenues	0	0
Eliminations | Other revenue
Revenue from Contracts with Customers
Other sales and revenues	$ (157)	$ (315)