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Investments of Operating Entities and Consolidated Funds - Operating Entities - Securities Owned at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investment Holdings [Line Items]    
Securities owned, at fair value ($200,278 and $941,595 were pledged to various parties) $ 776,046 $ 1,633,552
Estimate of Fair Value Measurement [Member]    
Investment Holdings [Line Items]    
Securities owned, at fair value ($200,278 and $941,595 were pledged to various parties) 9,600 8,400
Common Stock    
Investment Holdings [Line Items]    
Trading Securities, Equity 648,134 1,546,484
Preferred Stock    
Investment Holdings [Line Items]    
Trading Securities, Equity 14,700 12,656
Warrants and Rights [Member]    
Investment Holdings [Line Items]    
Trading Securities, Equity 23,491 22,109
Government Securities    
Investment Holdings [Line Items]    
Debt Securities, Trading [1] $ 61,198 $ 15,916
Investment Interest Rate   0.00%
Government Securities | Minimum    
Investment Holdings [Line Items]    
Investment Interest Rate 0.00%  
Government Securities | Maximum    
Investment Holdings [Line Items]    
Investment Interest Rate 8.75%  
Corporate Bonds    
Investment Holdings [Line Items]    
Debt Securities, Trading [2] $ 16,089 $ 25,500
Corporate Bonds | Minimum    
Investment Holdings [Line Items]    
Investment Interest Rate 0.00% 0.00%
Corporate Bonds | Maximum    
Investment Holdings [Line Items]    
Investment Interest Rate 15.50% 15.00%
Convertible Bonds    
Investment Holdings [Line Items]    
Debt Securities, Trading [3] $ 2,786 $ 2,500
Investment Interest Rate 8.00% 8.00%
Loans    
Investment Holdings [Line Items]    
Debt Securities, Trading [4] $ 0 $ 1,067
Trade Claims    
Investment Holdings [Line Items]    
Debt Securities, Trading [4] $ 9,648 $ 7,320
[1] As of March 31, 2020, maturities ranged from May 2020 to February 2048 and interest rates ranged from 0% to 8.75%. As of December 31, 2019, maturities ranged from January 2020 to June 2020 with an interest rate of 0%.
[2] As of March 31, 2020, maturities ranged from May 2020 to October 2027 and interest rates ranged from 0% to 15.5%. As of December 31, 2019, maturities ranged from January 2020 to May 2037 and interest rates ranged from 0% to 15.0%.
[3] As of March 31, 2020, maturities ranged from April 2020 to March 2022 with an interest rate of 8%. As of December 31, 2019, maturities ranged from April 2020 to March 2022 with an interest rate of 8%
[4] * The Company has elected the fair value option for securities owned, at fair value with a fair value of $9.6 million and $8.4 million, respectively, at March 31, 2020 and December 31, 2019.