SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jul. 01, 2016
Accounting Policies [Line Items]
Total assets	$ 4,758,497		$ 4,863,854
Total liabilities	3,997,502		3,739,754
Debt issuance cost	69,631		64,483
Amortization of deferred financing costs	5,771	$ 2,268
Provision for doubtful accounts	56,400		16,900
Bad debt expense	47,900	(500)
Purchase deposits	3,350	$ 9,250
Finance leases, net	7,000		7,600
Amortization of Lease Incentives	$ 7,500
Common stock dividends declared (in dollars per share)	$ 0.33	$ 0.33
Series A Preferred Shares
Accounting Policies [Line Items]
Preferred stock dividends declared (in dollars per share)	0.52
Series B Preferred Stock
Accounting Policies [Line Items]
Preferred stock dividends declared (in dollars per share)	0.50
Series C Preferred Stock
Accounting Policies [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 0.52
Other Assets
Accounting Policies [Line Items]
Inventory	$ 6,800		6,800
Debt fees	2,800		2,900
Capitalized costs, potential asset acquisitions	42,400		46,900
Purchase deposits	3,900		13,700
Prepaid expense	17,200		21,400
Notes receivable	54,400		40,400
Maintenance right assets	5,100		5,100
Other Assets, Aviation
Accounting Policies [Line Items]
Inventory	109,200		100,300
Other Assets, Commodity Inventory
Accounting Policies [Line Items]
Inventory	$ 6,800		$ 6,800
Customer One | Customer Concentration Risk | Sales Revenue, Segment | Transtar
Accounting Policies [Line Items]
Concentration risk	23.00%
Customer One | Customer Concentration Risk | Sales Revenue, Segment | Aviation Leasing
Accounting Policies [Line Items]
Concentration risk		11.00%
Customer One | Customer Concentration Risk | Accounts Receivable | Transtar
Accounting Policies [Line Items]
Concentration risk	14.00%
Customer One | Customer Concentration Risk | Accounts Receivable | Aviation Leasing
Accounting Policies [Line Items]
Concentration risk	19.00%		36.00%
Customer Two | Customer Concentration Risk | Accounts Receivable | Aviation Leasing
Accounting Policies [Line Items]
Concentration risk	10.00%		13.00%
Delaware River Partners LLC | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Ownership percentage				98.00%
Interest held in VIE, as a percentage	100.00%
Total assets	$ 316,500		$ 307,800
Total liabilities	$ 32,100		$ 32,600