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FAIR VALUE MEASUREMENTS - Credit Exposure to Insurance Companies (Details) - Life Insurance Carrier Concentration Risk
6 Months Ended
Jun. 30, 2023
Life Insurance Contract, Face Value | American General Life Insurance Company  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Concentration risk percentage 14.00%
Life Insurance Contract, Face Value | ReliaStar Life Insurance Company  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Concentration risk percentage 6.00%
Life Insurance Contract, Face Value | Lincoln National Life Insurance Company  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Concentration risk percentage 14.00%
Life Insurance Contract, Fair Value | American General Life Insurance Company  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Concentration risk percentage 11.00%
Life Insurance Contract, Fair Value | ReliaStar Life Insurance Company  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Concentration risk percentage 12.00%
Life Insurance Contract, Fair Value | Lincoln National Life Insurance Company  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Concentration risk percentage 12.00%