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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2012
Fair Value, by Balance Sheet Grouping, Methodology and Assumptions [Abstract]  
Fair Value Of Certain Financial Assets And Liabilities
The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:
 
 
At June 30, 2012
 
Fair Value Measurements at Reporting Date Using
Assets
Total
 
Quoted Prices
in
Active  Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Equity available-for-sale securities
$
12,453

 
$
12,453

 
$
—

 
$
—

Fixed income available-for-sale securities
68,785

 
—

 
68,785

 
—

Fixed income securities owned
21,057

 
—

 
21,057

 
—

Trading securities
53,253

 
3,865

 
—

 
49,388

 
$
155,548

 
$
16,318

 
$
89,842

 
$
49,388

 
 
At December 31, 2011
 
Fair Value Measurements at Reporting Date Using
Assets
Total
 
Quoted Prices
in
Active  Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Equity available-for-sale securities
$
8,010

 
$
8,010

 
$
—

 
$
—

Fixed income available-for-sale securities
74,998

 
—

 
74,998

 
—

Fixed income securities owned
20,949

 
—

 
20,949

 
—

Trading securities
56,325

 
3,702

 
—

 
52,623

 
$
160,282

 
$
11,712

 
$
95,947

 
$
52,623
Reconciliation For All Assets And Liabilities Of The Company Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)
The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2012 to June 30, 2012:
 
 
Trading Securities
Balance, January 1, 2012
$
52,623

Purchases
—

Issuances
—

Principal prepayments and settlements
(7,176
)
Sales
—

Total gains or (losses) (realized/unrealized):
 
Included in earnings
3,941

Included in other comprehensive income
—

Transfers in and out of Level 3
—

Balance, June 30, 2012
$
49,388

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2011 to June 30, 2011:
 
 
Trading Securities
Balance, January 1, 2011
$
100,645

Purchases
—

Issuances
—

Principal prepayments and settlements
(10,806
)
Sales
(34,706
)
Total gains or (losses) (realized/unrealized):
 
Included in earnings
4,920

Included in other comprehensive income
—

Transfers in and out of Level 3
—

Balance, June 30, 2011
$
60,053