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Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts Receivable, allowances $ 2,566 $ 2,436
Furniture, Equipment and Leasehold Improvements, accumulated depreciation and amortization 27,881 25,992
Intangible Assets, accumulated amortization $ 29,466 $ 27,538
Treasury Stock at Cost, shares 8,848,672 7,702,900
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 43,717,067 40,772,434
Common Stock, shares outstanding 34,868,395 33,069,534
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 31 42
Common Stock, shares outstanding 31 42