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Fair Value Measurements for Operating Entities and Consolidated Funds Carrying Value Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Cash and cash equivalents $ 193,066 $ 130,052 $ 117,824
Cash collateral pledged 16,092 17,888 16,995
Segregated cash 154,191 116,268 $ 140,656
Securities Borrowed, Gross 713,288 443,148  
Securities borrowed 713,288 443,148  
Loans Receivable, Net 36,009 37,993  
Cash and cash equivalents, Consolidated Funds 18,747 21,988  
Securities Loaned, Gross 548,629 456,831  
Securities loaned 548,629 456,831  
Convertible debt 133,126 141,502  
Notes payable and other debt 271,082 173,458  
Convertible Debt      
Convertible debt, unamortized discount 24,900 25,600  
Level 1      
Cash and cash equivalents, Fair Value 193,066 130,052  
Segregated cash fair value disclosures 154,191 116,268  
Cash and cash equivalents, Consolidated Funds, Fair Value 18,747 21,988  
Level 2      
Cash collateral pledged, Fair Value 16,092 17,888  
Securities Borrowed, Fair Value Disclosure 684,569 414,763  
Securities loaned, fair value disclosure 531,984 440,162  
Convertible debt, Fair Value [1] 173,246 172,709  
Notes payable and other debt, Fair Value [2] 284,021 182,352  
Level 3      
Loans Receivable, Fair Value Disclosure [3] $ 36,009 $ 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.