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Fair Value Measurements for Operating Entities and Consolidated Funds Carrying Value Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Mar. 10, 2014
Cash and cash equivalents $ 117,824 $ 110,990 $ 75,817 $ 157,232  
Cash collateral pledged 16,995 13,342      
Segregated Cash 140,656 1,024      
Securities Borrowed 371,367 0      
Loans Receivable, Net 23,007 31,088      
Cash and cash equivalents, Consolidated Funds 11,156 17,761      
Securities Loaned 414,957 0      
Convertible debt [1] 136,189 130,029      
Notes payable and other debt 101,267 77,030      
Convertible Debt          
Convertible debt, unamortized discount 12,200 17,800     $ 35,700
Level 1          
Cash and cash equivalents, Fair Value 117,824 110,990      
Segregated cash fair value disclosures 140,656 1,024      
Cash and cash equivalents, Consolidated Funds, Fair Value 11,156 17,761      
Level 2          
Cash collateral pledged, Fair Value 16,995 13,342      
Securities Borrowed, Fair Value Disclosure 358,673 0      
Securities loaned, fair value disclosure 407,706 0      
Convertible debt, Fair Value [2] 157,522 149,545      
Notes payable and other debt, Fair Value [3] 107,119 80,817      
Level 3          
Loans Receivable, Fair Value Disclosure [4] $ 23,007 $ 31,088      
[1] The carrying amount of the convertible debt includes an unamortized discount of $12.2 million and $17.8 million as of September 30, 2017 and December 31, 2016.
[2] The convertible debt includes the conversion option and is based on the last broker quote available.
[3] Notes payable and other debt are based on the last broker quote available.
[4] The fair market value of level 3 loans is calculated using discounted cash flows.