Reportable Segments (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment.	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Reportable Segments
Number of reportable segments | segment.				2
Number of operating segments | segment.				2
Revenue:
Leasing revenue		$ 65,381	$ 89,145	$ 204,437	$ 235,307
Gain on sale of leased equipment		0	4,589	1,367	19,279
Total revenue		70,613	120,366	227,205	319,932
Expenses:
Depreciation and amortization expense		24,022	22,736	71,176	63,037
Cost of spare parts and equipment sales		4,125	20,195	13,461	47,192
Write-down of equipment		5,245	6,954	14,371	11,321
General and administrative		16,461	23,257	51,256	66,086
Technical expense		827	1,739	3,422	4,934
Interest expense		15,351	16,572	47,136	51,232
Loss on debt extinguishment		0	0	4,688	220
Total net finance costs		15,351	16,572	51,824	51,452
Total expenses		66,031	91,453	205,510	244,022
Earnings (loss) from operations		4,582	28,913	21,695	75,910
Total assets	[1]	2,149,223		2,149,223		$ 1,940,608
Operating Segments | Leasing and  Related Operations
Revenue:
Leasing revenue		65,381	89,145	204,437	235,307
Gain on sale of leased equipment			4,589	1,367	19,279
Total revenue		67,839	105,533	213,792	275,754
Expenses:
Depreciation and amortization expense		23,993	22,716	71,107	62,975
Cost of spare parts and equipment sales		2	7,825	154	9,913
Write-down of equipment		5,245	6,954	14,371	11,321
General and administrative		15,578	22,081	48,928	61,974
Technical expense		827	1,739	3,422	4,933
Interest expense		15,351	16,572	47,136	51,232
Loss on debt extinguishment		0	0	4,688	220
Total net finance costs		15,351	16,572	51,824	51,452
Total expenses		60,996	77,887	189,806	202,568
Earnings (loss) from operations		6,843	27,646	23,986	73,186
Total assets		2,096,376		2,096,376		1,898,313
Operating Segments | Spare Parts Sales
Revenue:
Leasing revenue		0	0	0	0
Gain on sale of leased equipment			0	0	0
Total revenue		3,035	14,898	13,935	44,360
Expenses:
Depreciation and amortization expense		29	20	69	62
Cost of spare parts and equipment sales		4,123	12,370	13,307	37,279
Write-down of equipment		0	0	0	0
General and administrative		656	1,176	2,101	4,112
Technical expense		0	0	0	1
Interest expense		0	0	0	0
Loss on debt extinguishment		0	0	0	0
Total net finance costs		0	0	0	0
Total expenses		4,808	13,566	15,477	41,454
Earnings (loss) from operations		(1,773)	1,332	(1,542)	2,906
Total assets		52,847		52,847		42,295
Eliminations
Revenue:
Leasing revenue		0	0	0	0
Gain on sale of leased equipment			0	0	0
Total revenue		(261)	(65)	(522)	(182)
Expenses:
Depreciation and amortization expense		0	0	0	0
Cost of spare parts and equipment sales		0	0	0	0
Write-down of equipment		0	0	0	0
General and administrative		227	0	227	0
Technical expense		0	0	0	0
Interest expense		0	0	0	0
Loss on debt extinguishment		0	0	0	0
Total net finance costs		0	0	0	0
Total expenses		227	0	227	0
Earnings (loss) from operations		(488)	(65)	(749)	(182)
Total assets		0		0		$ 0
Lease rent revenue
Revenue:
Leasing revenue		30,025	49,090	114,874	142,484
Lease rent revenue | Operating Segments | Leasing and  Related Operations
Revenue:
Leasing revenue		30,025	49,090	114,874	142,484
Lease rent revenue | Operating Segments | Spare Parts Sales
Revenue:
Leasing revenue		0	0	0	0
Lease rent revenue | Eliminations
Revenue:
Leasing revenue		0	0	0	0
Maintenance reserve revenue
Revenue:
Leasing revenue		32,302	39,173	82,816	90,998
Maintenance reserve revenue | Operating Segments | Leasing and  Related Operations
Revenue:
Leasing revenue		32,302	39,173	82,816	90,998
Maintenance reserve revenue | Operating Segments | Spare Parts Sales
Revenue:
Leasing revenue		0	0	0	0
Maintenance reserve revenue | Eliminations
Revenue:
Leasing revenue		0	0	0	0
Spare parts and equipment sales
Revenue:
Maintenance reserve revenue		2,888	24,409	14,848	56,497
Spare parts and equipment sales | Operating Segments | Leasing and  Related Operations
Revenue:
Maintenance reserve revenue		115	9,583	1,442	12,334
Spare parts and equipment sales | Operating Segments | Spare Parts Sales
Revenue:
Maintenance reserve revenue		3,000	14,826	13,633	44,163
Spare parts and equipment sales | Eliminations
Revenue:
Maintenance reserve revenue		(227)	0	(227)	0
Other revenue
Revenue:
Maintenance reserve revenue		5,398	3,105	13,300	10,674
Other revenue | Operating Segments | Leasing and  Related Operations
Revenue:
Maintenance reserve revenue		5,397	3,098	13,293	10,659
Other revenue | Operating Segments | Spare Parts Sales
Revenue:
Maintenance reserve revenue		35	72	302	197
Other revenue | Eliminations
Revenue:
Maintenance reserve revenue		$ (34)	$ (65)	$ (295)	$ (182)

[1] Total assets at September 30, 2020 and December 31, 2019, respectively, include the following assets of variable interest entities (“VIEs”) that can only be used to settle the liabilities of the VIEs: Cash nil and $134; Restricted cash $66,317 and $56,523; Equipment $1,081,757 and $1,004,851; Maintenance Rights $767 and $3,133; Inventory $4,367 and $2,832; and Other assets $1,240  and $668, respectively.