Annual report [Section 13 and 15(d), not S-K Item 405]

EXTERNAL INVESTMENT MANAGER - Schedule of Balance Sheet (Details)

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EXTERNAL INVESTMENT MANAGER - Schedule of Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Total assets $ 5,121,341 $ 4,443,570                
Dividend payable to MSCC and its subsidiaries 22,100 20,368                
Equity 2,797,838 2,477,399 $ 2,108,586 $ 1,788,846 $ 1,514,767 $ 1,536,390 $ 1,476,049 $ 1,380,368 $ 1,201,481 $ 1,070,894
Total liabilities and net assets 5,121,341 4,443,570                
External Investment Manager                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Accounts receivable - advisory clients 10,183 10,777                
Intangible Asset 29,500 29,500                
Total assets 39,683 40,277                
Accounts payable to MSCC and its subsidiaries 7,785 7,551                
Dividend payable to MSCC and its subsidiaries 2,398 3,226                
Equity 29,500 29,500                
Total liabilities and net assets $ 39,683 $ 40,277