Annual report pursuant to Section 13 and 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
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
Dec. 31, 2014
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Total assets $ 4,443,570 $ 4,241,885                
Dividend payable to MSCC and its subsidiaries 20,368 17,676                
Equity 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 $ 939,982
Total liabilities and net assets 4,443,570 4,241,885                
External Investment Manager                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Accounts receivable - advisory clients 10,777 8,130                
Intangible Asset 29,500 29,500                
Total assets 40,277 37,630                
Accounts payable to MSCC and its subsidiaries 7,551 4,455                
Dividend payable to MSCC and its subsidiaries 3,226 3,675                
Equity 29,500 29,500                
Total liabilities and net assets $ 40,277 $ 37,630