Quarterly report pursuant to Section 13 or 15(d)

EXTERNAL INVESTMENT MANAGER - Schedule of Balance Sheet (Details)

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EXTERNAL INVESTMENT MANAGER - Schedule of Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Investment Company, Nonconsolidated Subsidiary [Line Items]                
Total assets $ 5,094,777     $ 4,443,570        
Dividend payable to MSCC and its subsidiaries 21,575     20,368        
Equity 2,692,254 $ 2,578,956 $ 2,515,970 2,477,399 $ 2,370,807 $ 2,254,948 $ 2,172,922 $ 2,108,586
Total liabilities and net assets 5,094,777     4,443,570        
External Investment Manager                
Investment Company, Nonconsolidated Subsidiary [Line Items]                
Accounts receivable - advisory clients 8,910     10,777        
Intangible Asset 29,500     29,500        
Total assets 38,410     40,277        
Accounts payable to MSCC and its subsidiaries 6,360     7,551        
Dividend payable to MSCC and its subsidiaries 2,550     3,226        
Equity 29,500     29,500        
Total liabilities and net assets $ 38,410     $ 40,277