Quarterly report pursuant to Section 13 or 15(d)

EXTERNAL INVESTMENT MANAGER - Balance Sheet (Details)

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EXTERNAL INVESTMENT MANAGER - Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Investment Company, Nonconsolidated Subsidiary [Line Items]            
Total assets $ 4,420,238   $ 4,241,885      
Dividend payable to MSCC and its subsidiaries 18,729   17,676      
Equity 2,254,948 $ 2,172,922 2,108,586 $ 1,865,163 $ 1,873,654 $ 1,788,846
Total liabilities and net assets 4,420,238   4,241,885      
External Investment Manager            
Investment Company, Nonconsolidated Subsidiary [Line Items]            
Accounts receivable to MSCC and its subsidiaries 10,416   8,130      
Intangible Asset 29,500   29,500      
Total assets 39,916   37,630      
Accounts payable to MSCC and its subsidiaries 7,557   4,455      
Dividend payable to MSCC and its subsidiaries 2,859   3,675      
Equity 29,500   29,500      
Total liabilities and net assets $ 39,916   $ 37,630