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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts Receivable, allowances $ 1,703 $ 1,313
Furniture, Equipment and Leasehold Improvements, accumulated depreciation and amortization 51,055 42,656
Intangible Assets, accumulated amortization $ 30,873 $ 21,754
Treasury Stock, Shares 19,013,157 15,626,288
Class A [Member]    
Common Stock, par value $ 0.01 $ 0.01
Common Stock, shares authorized 1,000,000,000 1,000,000,000
Common Stock, shares issued 57,913,271 55,249,559
Common Stock, shares outstanding 38,900,114 39,623,271
Class B [Member]    
Common Stock, par value $ 0.01 $ 0.01
Common Stock, shares authorized 1,000,000 1,000,000
Common Stock, shares issued 24 25
Common Stock, shares outstanding 24 25