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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 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 148,716,000 155,264,000
Common stock, shares outstanding 148,716,000 155,264,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000,000 2,000,000
Accounts receivable from related parties $ 26,884 $ 25,667
Securities owned, at fair value 34,895 17,319
Preferred Stock Redemption Value $ 72,667 $ 71,630
Series A Redeemable Convertible 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
WisdomTree ETF [Member]    
Securities owned, at fair value $ 23,932 $ 16,886