SCHEDULE I - Parent Company Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
REVENUE
Lease rent revenue									$ 190,690	$ 175,609
Maintenance reserve revenue									108,998	87,009
Spare parts and equipment sales									74,651	71,141
Gain on sale of leased equipment									20,044	6,944
Other revenue									14,777	7,644
Total revenue	$ 89,228	$ 120,366	$ 95,797	$ 103,769	$ 118,190	$ 80,958	$ 78,702	$ 70,497	409,160	348,347
EXPENSES
Transfers from Equipment held for operating lease to Equipment held for sale									10,131	0
Depreciation and amortization expense									86,236	76,814
Cost of spare parts and equipment sales									62,647	61,025
Write-down of equipment									18,220	10,651
General and administrative									86,523	72,021
Technical expense									8,122	11,142
Net finance costs									67,109	64,220
Total expenses									328,857	295,873
Earnings from operations									80,303	52,474
Earnings from joint ventures									8,578	3,800
Income before income taxes									88,881	56,274
Income tax (benefit) expense									(21,959)	(13,043)
Net income									66,922	43,231
Preferred stock dividends									3,250	3,250
Accretion of preferred stock issuance costs									84	83
Net income attributable to common shareholders	$ 4,156	$ 23,232	$ 16,144	$ 20,056	$ 17,274	$ 8,834	$ 7,528	$ 6,261	63,588	39,898
Parent Company
REVENUE
Lease rent revenue									64,566	70,269
Maintenance reserve revenue									48,500	27,407
Spare parts and equipment sales									18,561	35,388
Gain on sale of leased equipment									12,269	6,183
Other revenue									29,644	13,624
Total revenue									173,540	152,871
EXPENSES
Transfers from Equipment held for operating lease to Equipment held for sale									6,681	0
Depreciation and amortization expense									30,934	34,795
Cost of spare parts and equipment sales									17,108	32,331
Write-down of equipment									4,425	2,567
General and administrative									71,522	52,896
Technical expense									8,294	9,858
Net finance costs									18,898	25,210
Total expenses									151,181	157,657
Earnings from operations									22,359	(4,786)
Earnings from joint ventures									8,578	3,800
Income before income taxes									30,937	(986)
Income tax (benefit) expense									(9,456)	280
Equity in income of subsidiaries									45,441	43,937
Net income									66,922	43,231
Preferred stock dividends									3,250	3,250
Accretion of preferred stock issuance costs									84	83
Net income attributable to common shareholders									$ 63,588	$ 39,898