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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Amortized Cost $ 452,955 $ 402,824
Accounts Receivable, Allowances 3,563 5,372
Furniture, Equipment and Leasehold Improvements, Accumulated Depreciation and Amortization 159,249 139,572
Intangible Assets, Accumulated Amortization $ 3,204 $ 2,932
Treasury Stock at Cost, shares 35,546,178 31,445,058
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 74,631,561 72,195,283
Common Stock, Shares, Outstanding 39,085,383 40,750,225
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 47 48
Common Stock, Shares, Outstanding 47 48