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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investment Securities and Certificates of Deposit, amortized cost $ 583,638 $ 744,178
Accounts Receivable, allowances 6,153 5,603
Furniture, Equipment and Leasehold Improvements, accumulated depreciation and amortization $ 232,890 $ 212,929
Treasury Stock, Common, Shares 46,543,420 44,340,396
Class A [Member]    
Common Stock, Par Value (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000
Common Stock, Shares, Issued 84,587,099 82,114,009
Common Stock, Shares, Outstanding 38,043,679 37,773,613
Class B [Member]    
Common Stock, Par Value (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized 1,000,000 1,000,000
Common Stock, Shares, Issued 45 46
Common Stock, Shares, Outstanding 45 46