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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Accounting Policies [Line Items]          
Debt issuance cost $ 30,894   $ 30,894   $ 43,027
Amortization of deferred financing costs     17,142 $ 18,853  
Provision for doubtful accounts 55,000   55,000   16,900
Bad debt expense 0 $ 1,500 47,100 800  
Purchase deposits     28,621 $ 13,790  
Operating lease, ROU asset 3,200   3,200   3,800
Finance leases, net     7,100   7,600
Amortization of lease incentives $ 7,500   $ 7,500    
Common stock dividends declared (in dollars per share) $ 0.30 $ 0.33 $ 0.96 $ 0.99  
Continuing Operations          
Accounting Policies [Line Items]          
Amortization of deferred financing costs $ 3,500 $ 13,700 $ 15,200 $ 17,100  
Series A Preferred Shares          
Accounting Policies [Line Items]          
Preferred stock dividends declared (in dollars per share) $ 0.52 $ 0.52      
Series B Preferred Stock          
Accounting Policies [Line Items]          
Preferred stock dividends declared (in dollars per share) 0.50 0.50      
Series C Preferred Stock          
Accounting Policies [Line Items]          
Preferred stock dividends declared (in dollars per share) $ 0.52 $ 0.52      
Other Assets          
Accounting Policies [Line Items]          
Debt fees $ 5,600   5,600   2,400
Capitalized costs, potential asset acquisitions 35,500   35,500   46,900
Purchase deposits     28,600   13,700
Prepaid expense 3,500   3,500   4,000
Notes receivable 56,000   56,000   22,400
Maintenance right assets $ 12,400   $ 12,400   $ 5,100
Customer One | Customer Concentration Risk | Sales Revenue, Segment | Aviation Leasing          
Accounting Policies [Line Items]          
Concentration risk   14.00%   14.00%  
Customer One | Customer Concentration Risk | Accounts Receivable | Aviation Leasing          
Accounting Policies [Line Items]          
Concentration risk     28.00%   51.00%
Customer Two | Customer Concentration Risk | Accounts Receivable | Aviation Leasing          
Accounting Policies [Line Items]          
Concentration risk     12.00%   18.00%