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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 148,782,000 155,264,000
Common stock, shares outstanding 148,782,000 155,264,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000,000 2,000,000
Accounts receivable from related parties $ 23,420 $ 25,667
Securities owned, at fair value 32,574 17,319
Preferred Stock Redemption Value 50,690 71,630
WisdomTree ETF [Member]    
Securities owned, at fair value $ 23,906 $ 16,886
Series A Preferred Stock [Member]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 14.750 14.750
Preferred stock, shares issued 14.750 14.750
Preferred stock, shares outstanding 14.750 14.750