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
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total assets $ 4,293,255 $ 4,241,885    
Dividend payable to MSCC and its subsidiaries 18,036 17,676    
Stockholders' Equity Attributable to Parent 2,172,922 2,108,586 $ 1,873,654 $ 1,788,846
Total liabilities and net assets 4,293,255 4,241,885    
External Investment Manager        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Accounts receivable - advisory clients 9,405 8,130    
Intangible Asset 29,500 29,500    
Total assets 38,905 37,630    
Accounts payable to MSCC and its subsidiaries 6,349 4,455    
Dividend payable to MSCC and its subsidiaries 3,056 3,675    
Stockholders' Equity Attributable to Parent 29,500 29,500    
Total liabilities and net assets $ 38,905 $ 37,630