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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Summary of Ownership Interests in Investments Held Under Fair Value Accounting A summary of our
ownership interests in the investments held under fair value accounting as of December 31, 2020 is presented in the following table:
Limited partnershipCompany Direct and Indirect Ownership in Limited Partnership
Managed funds of funds
Strategic Investors Fund, LP12.6 %
Capital Preferred Return Fund, LP20.0 
Growth Partners, LP33.0 
Maximum Estimated Useful Lives by Asset Classification The maximum estimated useful lives by asset classification are as follows:
Leasehold improvements Lesser of lease term or asset life
Furniture and equipment7 years
Computer software
 3-7 years
Computer hardware
 3-5 years