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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue									$ 142,895	$ 190,690
Gain on sale of leased equipment									3,391	20,044
Revenue	$ 61,487	$ 70,613	$ 74,983	$ 81,609	$ 89,228	$ 120,366	$ 95,797	$ 103,769	288,692	409,160
Lease rent revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue									142,895	190,690
Maintenance reserve revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue									105,365	108,998
Spare parts and equipment sales
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									18,625	74,651
Managed services
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									8,753	10,843
Other revenue
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									9,663	3,934
Operating Segments | Leasing and  Related Operations
Revenue from Contracts with Customers
Gain on sale of leased equipment									3,391	20,044
Revenue									271,569	353,154
Operating Segments | Leasing and  Related Operations | Lease rent revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue									142,895	190,690
Operating Segments | Leasing and  Related Operations | Maintenance reserve revenue
Revenue from Contracts with Customers
Leasing and maintenance reserve revenue									105,365	108,998
Operating Segments | Leasing and  Related Operations | Spare parts and equipment sales
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									1,514	18,684
Operating Segments | Leasing and  Related Operations | Managed services
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									8,753	10,843
Operating Segments | Leasing and  Related Operations | Other revenue
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									9,651	3,895
Operating Segments | Spare Parts Sales
Revenue from Contracts with Customers
Gain on sale of leased equipment									0	0
Revenue									17,841	56,244
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
Spare parts, managed services, and other revenues									17,514	55,967
Operating Segments | Spare Parts Sales | Managed services
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									0	0
Operating Segments | Spare Parts Sales | Other revenue
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									327	277
Eliminations
Revenue from Contracts with Customers
Gain on sale of leased equipment									0	0
Revenue									(718)	(238)
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
Spare parts, managed services, and other revenues									(403)	0
Eliminations | Managed services
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									0	0
Eliminations | Other revenue
Revenue from Contracts with Customers
Spare parts, managed services, and other revenues									$ (315)	$ (238)

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The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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