Reportable Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2021 USD ($) segment.	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Reportable Segments
Number of reportable segments | segment.		2
Number of operating segments | segment.		2
Revenue:
Lease rent revenue			$ 46,395
Gain on sale of leased equipment		$ 0	2,067
Total revenue		61,125	81,609
Expenses:
Depreciation and amortization expense		24,141	23,390
Cost of spare parts and equipment sales		3,809	6,688
Write-down of equipment		1,867	2,129
General and administrative		16,151	19,567
Technical expense		1,310	1,127
Interest expense		15,019	15,696
Loss on debt extinguishment		0	4,688
Total net finance costs		15,019	20,384
Total expenses		62,297	73,285
(Loss) earnings from operations		(1,172)	8,324
Total assets	[1]	2,409,674		$ 2,364,948
Operating Segments | Leasing and  Related Operations
Revenue:
Lease rent revenue			46,395
Gain on sale of leased equipment			2,067
Total revenue		56,623	73,724
Expenses:
Depreciation and amortization expense		24,112	23,375
Cost of spare parts and equipment sales		6	148
Write-down of equipment		1,867	2,129
General and administrative		15,557	18,542
Technical expense		1,310	1,127
Interest expense		15,019	15,696
Loss on debt extinguishment			4,688
Total net finance costs		15,019	20,384
Total expenses		57,871	65,705
(Loss) earnings from operations		(1,248)	8,019
Total assets		2,358,186		2,312,172
Operating Segments | Spare Parts Sales
Revenue:
Lease rent revenue			0
Gain on sale of leased equipment			0
Total revenue		4,647	8,119
Expenses:
Depreciation and amortization expense		29	15
Cost of spare parts and equipment sales		3,817	6,540
Write-down of equipment		0	0
General and administrative		484	1,025
Technical expense		0	0
Interest expense		0	0
Loss on debt extinguishment			0
Total net finance costs		0	0
Total expenses		4,330	7,580
(Loss) earnings from operations		317	539
Total assets		51,488		52,776
Eliminations
Revenue:
Lease rent revenue			0
Gain on sale of leased equipment			0
Total revenue		(145)	(234)
Expenses:
Depreciation and amortization expense		0	0
Cost of spare parts and equipment sales		(14)	0
Write-down of equipment		0	0
General and administrative		110	0
Technical expense		0	0
Interest expense		0	0
Loss on debt extinguishment			0
Total net finance costs		0	0
Total expenses		96	0
(Loss) earnings from operations		(241)	(234)
Total assets		0		$ 0
Lease rent revenue
Revenue:
Lease rent revenue		31,520	46,395
Lease rent revenue | Operating Segments | Leasing and  Related Operations
Revenue:
Lease rent revenue		31,520	46,395
Lease rent revenue | Operating Segments | Spare Parts Sales
Revenue:
Lease rent revenue		0	0
Lease rent revenue | Eliminations
Revenue:
Lease rent revenue		0	0
Maintenance reserve revenue
Revenue:
Lease rent revenue		19,812	20,528
Maintenance reserve revenue | Operating Segments | Leasing and  Related Operations
Revenue:
Lease rent revenue		19,812	20,528
Maintenance reserve revenue | Operating Segments | Spare Parts Sales
Revenue:
Lease rent revenue		0	0
Maintenance reserve revenue | Eliminations
Revenue:
Lease rent revenue		0	0
Spare parts and equipment sales
Revenue:
Maintenance reserve revenue		4,566	9,105
Spare parts and equipment sales | Operating Segments | Leasing and  Related Operations
Revenue:
Maintenance reserve revenue		85	1,225
Spare parts and equipment sales | Operating Segments | Spare Parts Sales
Revenue:
Maintenance reserve revenue		4,591	7,880
Spare parts and equipment sales | Eliminations
Revenue:
Maintenance reserve revenue		(110)	0
Other revenue
Revenue:
Maintenance reserve revenue		5,227	3,514
Other revenue | Operating Segments | Leasing and  Related Operations
Revenue:
Maintenance reserve revenue		5,206	3,509
Other revenue | Operating Segments | Spare Parts Sales
Revenue:
Maintenance reserve revenue		56	239
Other revenue | Eliminations
Revenue:
Maintenance reserve revenue		$ (35)	$ (234)

[1] Total assets at March 31, 2021 and December 31, 2020, respectively, include the following assets of variable interest entities (“VIEs”) that can only be used to settle the liabilities of the VIEs: Restricted cash $33,763 and $35,262; Equipment $1,025,492 and $1,037,684; Maintenance Rights $767 and $767; Inventory $5,437 and $5,437; Notes receivable $26,220 and $26,392; and Other assets $604 and $558, respectively.