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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2020
Summary of Significant Accounting Policies (Tables) [Line Items]  
Schedule of securities and other investments owned and securities sold not yet purchased at fair value
   September 30,   December 31, 
   2020   2019 
Securities and other investments owned:        
Equity securities  $392,674   $353,162 
Corporate bonds   5,956    19,020 
Other fixed income securities   3,557    8,414 
Partnership interests and other   57,293    27,617 
   $459,480   $408,213 
           
Securities sold not yet purchased:          
Equity securities  $42,086   $5,360 
Corporate bonds   4,490    33,436 
Other fixed income securities   1,549    3,024 
   $48,125   $41,820 

 

Schedule of financial assets and liabilities measured on recurring basis
   Financial Assets and Liabilities Measured at Fair Value
on a Recurring Basis at September 30, 2020 Using
 
   Fair value at
September 30,
   Quoted prices in active markets for identical assets   Other observable inputs   Significant unobservable inputs 
   2020   (Level 1)   (Level 2)   (Level 3) 
Assets:                
Securities and other investments owned:                
Equity securities  $392,674   $290,425   $
   $102,249 
Corporate bonds   5,956    
    5,956    
 
Other fixed income securities   3,557    
    3,557    
 
Investment funds valued at net asset value(1)   57,293                
Total securities and other investments owned   459,480    290,425    9,513    102,249 
Loans receivable, at fair value   344,339    
    
    344,339 
Total assets measured at fair value  $803,819   $290,425   $9,513   $446,588 
                     
Liabilities:                    
Securities sold not yet purchased:                    
Equity securities  $42,086   $42,086   $
   $
 
Corporate bonds   4,490    
    4,490    
 
Other fixed income securities   1,549    
    1,549    
 
Total securities sold not yet purchased   48,125    42,086    6,039    
 
Mandatorily redeemable noncontrolling interests issued after November 5, 2003   4,462    
    
    4,462 
Total liabilities measured at fair value  $52,587   $42,086   $6,039   $4,462 

 

   Financial Assets and Liabilities Measured at Fair Value 
   on a Recurring Basis at December 31, 2019 Using 
   Fair value at
December 31,
2019
   Quoted prices in active markets for identical assets
(Level 1)
   Other observable inputs
(Level 2)
   Significant unobservable inputs
(Level 3)
 
Assets:                
Securities and other investments owned:                    
Equity securities  $353,162   $243,911   $
   $109,251 
Corporate bonds   19,020    
    19,020    
 
Other fixed income securities   8,414    
    8,414    
 
Investment funds valued at net asset value(1)   27,617                
Total securities and other investments owned   408,213    243,911    27,434    109,251 
Loans receivable, at fair value   43,338    
    
    43,338 
Total assets measured at fair value  $451,551   $243,911   $27,434   $152,589 
                     
Liabilities:                    
Securities sold not yet purchased:                    
Equity securities  $5,360   $5,360   $
   $
 
Corporate bonds   33,436    
    33,436    
 
Other fixed income securities   3,024    
    3,024    
 
Total securities sold not yet purchased   41,820    5,360    36,460    
 
                     
Mandatorily redeemable noncontrolling interests issued after November 5, 2003   4,616    
    
    4,616 
Total liabilities measured at fair value  $46,436   $5,360   $36,460   $4,616 

 

Schedule of fair value measurement of level 3 financial assets and liabilities
   Fair value at             
   September 30,            Weighted
   2020   Valuation Technique  Unobservable Input  Range  Average
Assets:                
Equity securities  $102,249   Market approach  Multiple of revenue  2.49x - 6.29x  4.92x
           Multiple of EBITDA  5.50x - 10.00x  5.70x
           Multiple of PV-10  .28x  .28x
           Market price of related security  $0.43 - $4.00/share  $1.39
        Option pricing model  Annualized volatility  107.0%  107.0%
Loans receivable at fair value   344,339   Discounted cash flow  Market interest rate  4.9%-17.3%  15%
        Market approach  Market price of related security  $0.43/share  $0.43
Total level 3 assets measured at fair value  $446,588             
                  
Liabilities:                 
Mandatorily redeemable noncontrolling interests issued after November 5, 2003  $4,462   Market approach  Operating income multiple  6.0x  6.0x

 

Schedule of investments in the VIE
Partnership investments  $20,308 
Due from related party   372 
Maximum exposure to loss  $20,680 

 

Fair Value, Inputs, Level 3 [Member]  
Summary of Significant Accounting Policies (Tables) [Line Items]  
Schedule of fair value measurement of level 3 financial assets and liabilities
   Level 3   Level 3 Changes During the Period   Level 3 
   Balance at   Fair   Relating to   Purchases,   Transfer in   Balance at 
   Beginning of   Value   Undistributed   Sales and   and/or out   End of 
   Year   Adjustments   Earnings   Settlements   of Level 3   Period 
Nine Months Ended September 30, 2020                        
Equity securities  $109,251   $(11,314)  $
   $4,984   $(672)  $102,249 
Loans receivable at fair value   43,338    (21,834)   3,134    93,853    225,848    344,339 
Mandatorily redeemable noncontrolling interests issued after November 5, 2003   4,616    
    (154)   
    
    4,462 
Nine Months Ended September 30, 2019                              
Equity securities  $24,577   $715   $1,424   $24,215   $
   $50,931 
Loans receivable at fair value   33,731    11,648    1,621    (11,489)   
    35,511 
Mandatorily redeemable noncontrolling interests issued after November 5, 2003   4,633    
    (238)   
    
    4,395