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Regulatory Requirements (Tables)
9 Months Ended
Sep. 30, 2012
Regulatory Requirements [Abstract]  
Regulatory Requirements Uniform Net Capital Rule
                 
    September 30,     December 31,  
    2012     2011  

Net Capital

  $ 386,778     $ 360,167  

Minimum Net Capital Requirement

    42,978       38,139  

Ratio of Aggregate Indebtedness to Net Capital

    1.67 to 1       1.59 to 1