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Fair Value Measurements for Operating Entities and Consolidated Funds Carrying Value Disclosures (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Mar. 10, 2014
Dec. 31, 2013
Cash and cash equivalents $ 92,854 $ 129,509 $ 66,166   $ 54,720
Cash collateral pledged 9,129 8,306      
Securities borrowed 0 676,100      
Cash and cash equivalents, Consolidated Funds 16,625 501      
Securities loaned 0 682,493      
Convertible debt 123,149 118,475      
Notes payable and other debt 66,628 67,144      
Convertible Debt          
Convertible debt, unamortized discount 26,400 31,000   $ 35,700  
Level 1          
Cash and cash equivalents, Fair Value 92,854 129,509      
Securities borrowed, Fair Value 0 660,445      
Cash and cash equivalents, Consolidated Funds, Fair Value 16,625 501      
Securities Loaned, Fair Value 0 661,533      
Level 2          
Cash collateral pledged, Fair Value 9,129 8,306      
Convertible debt, Fair Value [1] 158,470 160,713      
Notes payable and other debt, Fair Value $ 69,436 $ 69,548      
[1] The convertible debt include the conversion option and is based on the last broker quote available.