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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Insurance, Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total mortgage and other loan receivables $ 35,650,926 $ 29,250,836
Allowance for credit losses at acquisition $ 120,300 $ 121,895
Solar Energy System    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment, useful life 35 years  
Aircrafts | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment, useful life 25 years  
Railcars | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment, useful life 45 years  
Financial Asset Acquired with Credit Deterioration    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total mortgage and other loan receivables $ 3,700,000  
Writeoff of allowance $ 183,600