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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investments, Fair Value Disclosure $ 1,405 $ 84,242
Common Stock    
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 2,010,000,000 2,010,000,000
Common stock, shares issued (in shares) 771,697,087 760,939,440
Common stock, shares outstanding (in shares) 565,814,732 569,084,312
Treasury Stock    
Treasury stock (in shares) 205,882,355 191,855,128