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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowances $ 7,551 $ 6,037
Furniture, Equipment and Leasehold Improvements, Accumulated Depreciation and Amortization 95,587 89,494
Intangible Assets, Accumulated Amortization $ 43,517 $ 41,217
Treasury Stock at Cost, Shares 27,372,948 26,123,438
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 68,441,333 65,872,014
Common Stock, Shares Outstanding 41,068,385 39,748,576
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 86 86
Common Stock, Shares Outstanding 86 86