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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost $ 328,994 $ 802,652
Accounts Receivable, Allowances 8,712 4,683
Furniture, Equipment and Leasehold Improvements, Accumulated Depreciation and Amortization $ 201,647 $ 187,077
Treasury Stock at Cost, shares 44,028,278 41,339,113
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 81,914,589 79,686,375
Common Stock, Shares, Outstanding 37,886,311 38,347,262
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 50
Common Stock, Shares, Outstanding 45 50