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Fair Value Measurements for Operating Entities and Consolidated Funds Carrying Value Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 259,148 $ 130,052 $ 110,990
Cash collateral pledged 6,318 17,888 13,342
Segregated cash 176,647 116,268 $ 1,024
Securities Borrowed, Gross 407,795 443,148  
Securities borrowed, financial instruments   414,778  
Securities borrowed 407,795 443,148  
Loans Receivable, Net 36,021 37,993  
Cash and cash equivalents, Consolidated Funds 38,118 21,988  
Securities Loaned, Gross 414,852 456,831  
Securities Loaned, Financial instruments   439,228  
Convertible debt 134,489 141,502  
Notes payable and other debt 262,965 173,458  
Convertible Debt      
Convertible debt, unamortized discount 24,900 25,600  
Level 1      
Cash and cash equivalents, Fair Value 259,148 130,052  
Segregated cash fair value disclosures 176,647 116,268  
Cash and cash equivalents, Consolidated Funds, Fair Value 38,118 21,988  
Level 2      
Cash collateral pledged, Fair Value 6,318 17,888  
Securities borrowed, financial instruments 383,593    
Securities Borrowed, Fair Value Disclosure   414,763  
Securities Loaned, Financial instruments 391,310    
Securities loaned, fair value disclosure   440,162  
Convertible debt, Fair Value [1] 157,433 172,709  
Notes payable and other debt, Fair Value [2] 258,546 182,352  
Level 3      
Loans Receivable, Fair Value Disclosure [3] $ 36,021 $ 37,993  
[1] The convertible debt includes the conversion option and is based on the last broker quote available.
[2] Notes payable and other debt are based on the last broker quote available.
[3] The fair market value of level 3 loans is calculated using discounted cash flows.