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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 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 149,796,000 155,264,000
Common stock, shares outstanding 149,796,000 155,264,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000,000 2,000,000
Accounts receivable from related parties $ 22,026 $ 25,667
Securities owned, at fair value 13,110 17,319
Preferred Stock Redemption Value 50,244 71,630
WisdomTree ETF [Member]    
Securities owned, at fair value $ 12,929 $ 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