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Trading Securities Owned and Trading Securities Sold, But Not Yet Purchased (Tables)
12 Months Ended
Dec. 31, 2011
Trading Securities Owned and Trading Securities Sold, But Not Yet Purchased  
Components of Trading Securities Owned and Trading Securities Sold, But Not Yet Purchased
         
 
December 31,
2011
 
December 31,
2010
 
Trading securities owned:
       
U.S. government agency securities
$ 66,424   $ 86,882  
U.S. government securities
  32,845     9,038  
Corporate securities:
           
Fixed income securities
  244,535     221,145  
Equity securities
  38,551     46,877  
State and municipal securities
  111,288     80,228  
  $ 493,643   $ 444,170  
Trading securities sold, but not yet purchased:
           
U.S. government securities
$ 109,776   $ 131,561  
U.S. government agency securities
  954     664  
Corporate securities:
           
Fixed income securities
  149,460     61,026  
Equity securities
  6,060     6,800  
State and municipal securities
  583     89  
  $ 266,833   $ 200,140