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Fair Value Measurements for Operating Entities and Consolidated Funds Carrying Value Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents $ 130,052 $ 110,990 $ 157,232 $ 129,509
Cash collateral pledged 17,888 13,342    
Segregated Cash 116,268 1,024    
Securities Borrowed 443,148 0    
Loans Receivable, Net 37,993 31,088    
Cash and cash equivalents, Consolidated Funds 21,988 17,761    
Securities Loaned 456,831 0    
Convertible debt 141,502 130,029    
Notes payable and other debt 173,458 77,030    
Convertible Debt        
Convertible debt, unamortized discount 25,600 17,800    
Level 1        
Cash and cash equivalents, Fair Value 130,052 110,990    
Segregated cash fair value disclosures 116,268 1,024    
Cash and cash equivalents, Consolidated Funds, Fair Value 21,988 17,761    
Level 2        
Cash collateral pledged, Fair Value 17,888 13,342    
Securities Borrowed, Fair Value Disclosure 414,763 0    
Securities loaned, fair value disclosure 440,162 0    
Convertible debt, Fair Value [1] 172,709 149,545    
Notes payable and other debt, Fair Value [2] 182,352 80,817    
Level 3        
Loans Receivable, Fair Value Disclosure [3] $ 37,993 $ 31,088    
[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.