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Fair Value Measurements (Schedule Of Categorization Of Investments And Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value $ 127,178 $ 52,217
Total Assets Measured At Fair Value 254,757 158,485
Level I [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value 127,178 52,217
Total Assets Measured At Fair Value 145,266 67,805
Level II [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 109,491 90,680
Level III [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value      
Total Assets Measured At Fair Value      
Corporate Bonds, Municipal Bonds And Other Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 106,951 [1] 89,931 [1]
Corporate Bonds, Municipal Bonds And Other Debt Securities [Member] | Level II [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 106,951 [1] 89,931 [1]
Corporate Bonds, Municipal Bonds And Other Debt Securities [Member] | Level III [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value    [1]    [1]
Seed Capital Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 11,690 16,337
Seed Capital Investments [Member] | Level I [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 9,150 15,588
Seed Capital Investments [Member] | Level II [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 2,540 749
Seed Capital Investments [Member] | Level III [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value      
Mutual Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 8,938  
Mutual Funds [Member] | Level I [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 8,938  
Mutual Funds [Member] | Level III [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value     
Municipal Bonds And Commercial Paper [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents $ 46,291 $ 13,438
[1] Includes $46,291 and $13,438 of municipal bonds and commercial paper classified within Cash and Cash Equivalents on the Consolidated Statement of Financial Condition as of December 31, 2011 and 2010, respectively.