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Fair Value of Financial Instruments (Schedule of Valuation of Financial Instruments by Pricing Observability Levels) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Cash equivalents$ 16,152$ 15,675
Trading securities owned526,444444,170
Available-for-sale securities1,312,7841,012,714
Investments148,550178,936
Total Assets2,003,9301,651,495
Trading securities sold, but not yet purchased272,190200,140
Derivative contracts, Liabilities 9,259[1]
Derivative contracts, Liabilities25,672[2] 
Total Liabilities314,677[1]229,334
Auction Rate Securities [Member] | Auction Rate Equity Securities [Member]
  
Investments64,20376,826
Auction Rate Securities [Member] | Auction Rate Equity Securities [Member] | Level 1 [Member]
  
Investments00
Auction Rate Securities [Member] | Auction Rate Equity Securities [Member] | Level 2 [Member]
  
Investments00
Auction Rate Securities [Member] | Auction Rate Equity Securities [Member] | Level 3 [Member]
  
Investments64,20376,826
Auction Rate Securities [Member] | Auction Rate Municipal Securities [Member]
  
Investments7,0446,533
Auction Rate Securities [Member] | Auction Rate Municipal Securities [Member] | Level 1 [Member]
  
Investments00
Auction Rate Securities [Member] | Auction Rate Municipal Securities [Member] | Level 2 [Member]
  
Investments00
Auction Rate Securities [Member] | Auction Rate Municipal Securities [Member] | Level 3 [Member]
  
Investments7,0446,533
Corporate Securities [Member] | Corporate Fixed Income Securities [Member]
  
Trading securities owned264,623221,145
Trading securities sold, but not yet purchased129,22661,026
Corporate Securities [Member] | Corporate Fixed Income Securities [Member] | Level 1 [Member]
  
Trading securities owned61,15147,001
Trading securities sold, but not yet purchased55,37518,815
Corporate Securities [Member] | Corporate Fixed Income Securities [Member] | Level 2 [Member]
  
Trading securities owned202,271133,901
Trading securities sold, but not yet purchased73,85137,526
Corporate Securities [Member] | Corporate Fixed Income Securities [Member] | Level 3 [Member]
  
Trading securities owned1,20140,243
Trading securities sold, but not yet purchased04,685
Corporate Securities [Member] | Auction Rate Equity Securities [Member]
  
Trading securities owned40,88646,877
Trading securities sold, but not yet purchased33,0716,800
Corporate Securities [Member] | Auction Rate Equity Securities [Member] | Level 1 [Member]
  
Trading securities owned40,51546,395
Trading securities sold, but not yet purchased33,0326,780
Corporate Securities [Member] | Auction Rate Equity Securities [Member] | Level 2 [Member]
  
Trading securities owned371482
Trading securities sold, but not yet purchased3920
Corporate Securities [Member] | Auction Rate Equity Securities [Member] | Level 3 [Member]
  
Trading securities owned00
Trading securities sold, but not yet purchased00
U.S. Government Agency Securities [Member]
  
Trading securities owned71,33386,882
Available-for-sale securities 25,030
Trading securities sold, but not yet purchased 664
U.S. Government Agency Securities [Member] | Level 1 [Member]
  
Trading securities owned00
Available-for-sale securities 0
Trading securities sold, but not yet purchased 0
U.S. Government Agency Securities [Member] | Level 2 [Member]
  
Trading securities owned71,33386,882
Available-for-sale securities 25,030
Trading securities sold, but not yet purchased 664
U.S. Government Agency Securities [Member] | Level 3 [Member]
  
Trading securities owned00
Available-for-sale securities 0
Trading securities sold, but not yet purchased 0
U.S. Government Securities [Member]
  
Trading securities owned12,2029,038
Available-for-sale securities904 
Investments 8,751
Trading securities sold, but not yet purchased109,568131,561
U.S. Government Securities [Member] | Level 1 [Member]
  
Trading securities owned12,2029,038
Available-for-sale securities0 
Investments 8,751
Trading securities sold, but not yet purchased109,568131,561
U.S. Government Securities [Member] | Level 2 [Member]
  
Trading securities owned00
Available-for-sale securities904 
Investments 0
Trading securities sold, but not yet purchased00
U.S. Government Securities [Member] | Level 3 [Member]
  
Trading securities owned00
Available-for-sale securities0 
Investments 0
Trading securities sold, but not yet purchased00
State and Municipal Securities [Member]
  
Trading securities owned137,40080,228
Available-for-sale securities84,01226,343
Trading securities sold, but not yet purchased32589
State and Municipal Securities [Member] | Level 1 [Member]
  
Trading securities owned00
Available-for-sale securities00
Trading securities sold, but not yet purchased00
State and Municipal Securities [Member] | Level 2 [Member]
  
Trading securities owned137,40080,228
Available-for-sale securities17,38814,907
Trading securities sold, but not yet purchased32589
State and Municipal Securities [Member] | Level 3 [Member]
  
Trading securities owned00
Available-for-sale securities66,62411,436
Trading securities sold, but not yet purchased00
Corporate Fixed Income Securities [Member]
  
Available-for-sale securities409,817154,901
Corporate Fixed Income Securities [Member] | Level 1 [Member]
  
Available-for-sale securities301,87134,897
Corporate Fixed Income Securities [Member] | Level 2 [Member]
  
Available-for-sale securities95,946120,004
Corporate Fixed Income Securities [Member] | Level 3 [Member]
  
Available-for-sale securities12,0000
Agency [Member]
  
Available-for-sale securities506,767697,163
Agency [Member] | Level 1 [Member]
  
Available-for-sale securities00
Agency [Member] | Level 2 [Member]
  
Available-for-sale securities506,767697,163
Agency [Member] | Level 3 [Member]
  
Available-for-sale securities00
Commercial [Member]
  
Available-for-sale securities265,92567,996
Commercial [Member] | Level 1 [Member]
  
Available-for-sale securities00
Commercial [Member] | Level 2 [Member]
  
Available-for-sale securities265,92567,996
Commercial [Member] | Level 3 [Member]
  
Available-for-sale securities00
Non-Agency [Member]
  
Available-for-sale securities18,25729,273
Non-Agency [Member] | Level 1 [Member]
  
Available-for-sale securities00
Non-Agency [Member] | Level 2 [Member]
  
Available-for-sale securities18,25729,273
Non-Agency [Member] | Level 3 [Member]
  
Available-for-sale securities00
Asset-backed Securities [Member]
  
Available-for-sale securities27,10212,008
Asset-backed Securities [Member] | Level 1 [Member]
  
Available-for-sale securities00
Asset-backed Securities [Member] | Level 2 [Member]
  
Available-for-sale securities27,10212,008
Asset-backed Securities [Member] | Level 3 [Member]
  
Available-for-sale securities00
Corporate Equity Securities [Member]
  
Investments4,6763,335
Corporate Equity Securities [Member] | Level 1 [Member]
  
Investments4,2833,335
Corporate Equity Securities [Member] | Level 2 [Member]
  
Investments3930
Corporate Equity Securities [Member] | Level 3 [Member]
  
Investments00
Mutual Funds [Member]
  
Investments33,81132,193
Mutual Funds [Member] | Level 1 [Member]
  
Investments33,81132,193
Mutual Funds [Member] | Level 2 [Member]
  
Investments00
Mutual Funds [Member] | Level 3 [Member]
  
Investments00
Other [Member]
  
Investments38,81651,298
Other [Member] | Level 1 [Member]
  
Investments43610,489
Other [Member] | Level 2 [Member]
  
Investments7772,307
Other [Member] | Level 3 [Member]
  
Investments37,60338,502
Securities Sold, Not yet Purchased [Member]
  
Trading securities sold, but not yet purchased16,81519,935[2]
Securities Sold, Not yet Purchased [Member] | Level 1 [Member]
  
Trading securities sold, but not yet purchased16,81519,935[2]
Securities Sold, Not yet Purchased [Member] | Level 2 [Member]
  
Trading securities sold, but not yet purchased00[2]
Securities Sold, Not yet Purchased [Member] | Level 3 [Member]
  
Trading securities sold, but not yet purchased00[2]
Level 1 [Member]
  
Cash equivalents16,15215,675
Trading securities owned113,868102,434
Available-for-sale securities301,87134,897
Investments38,53054,768
Total Assets470,421207,774
Trading securities sold, but not yet purchased197,975157,156
Derivative contracts, Liabilities 0[1]
Derivative contracts, Liabilities0[2] 
Total Liabilities214,790[1]177,091
Level 2 [Member]
  
Cash equivalents00
Trading securities owned411,375301,493
Available-for-sale securities932,289966,381
Investments1,1702,307
Total Assets1,344,8341,270,181
Trading securities sold, but not yet purchased74,21538,299
Derivative contracts, Liabilities 9,259[1]
Derivative contracts, Liabilities25,672[2] 
Total Liabilities99,887[1]47,558
Level 3 [Member]
  
Cash equivalents00
Trading securities owned1,20140,243
Available-for-sale securities78,62411,436
Investments108,850121,861
Total Assets188,675173,540
Trading securities sold, but not yet purchased04,685
Derivative contracts, Liabilities 0[1]
Derivative contracts, Liabilities0[2] 
Total Liabilities$ 0[1]$ 4,685
[1]Included in accounts payable and accrued expenses in the consolidated statements of financial condition.
[2]Included in other liabilities in the consolidated statements of financial condition.