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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - REVOLVING CREDIT AGREEMENT (Details) - USD ($)
Oct. 13, 2017
May 19, 2015
Dec. 31, 2022
Dec. 31, 2021
Jul. 16, 2021
Jul. 15, 2021
Debt Instrument [Line Items]            
Notes payable – direct corporate obligations     $ 1,138,800,000 $ 1,137,300,000    
Minimum | Eurodollar            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.375%          
Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.375%          
Maximum | Eurodollar            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.125%          
Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.125%          
Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 250,000,000 $ 150,000,000        
Debt Instrument, term   4 years        
Initial drawing amount   $ 100,000,000        
Total capitalization percentage         15.00%  
Minimum consolidated net worth percentage         25.00% 50.00%
Notes payable – direct corporate obligations     $ 0 $ 0    
Potential additional borrowing capacity   100,000,000        
Debt covenant, required minimum debt to total capitalization ratio 35.00%          
Debt covenant, actual debt to total capitalization ratio at period end     21.60%      
Debt covenant, minimum required consolidated net worth, component one, amount   $ 2,674,000,000        
Debt covenant, minimum required consolidated net worth, component two, as a percent of net equity proceeds received from issuance and sale of equity interests   25.00%        
Debt covenant, actual consolidated net worth at period end     $ 3,493,900,000      
Debt covenant, required minimum consolidated net worth, amount     $ 2,694,400,000      
Revolving Credit Facility | Line of Credit | Federal Funds Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.50%          
Revolving Credit Facility | Line of Credit | Minimum            
Debt Instrument [Line Items]            
Remaining borrowing capacity   $ 50,000,000        
Revolving Credit Facility | Line of Credit | Maximum            
Debt Instrument [Line Items]            
Remaining borrowing capacity $ 100,000,000          
Bridge Loan | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity   5,000,000        
Letter of Credit | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 5,000,000