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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts on accounts receivable $ 3,004 $ 8,784
Preferred stock, par value $ 1 $ 1
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 475,000,000 475,000,000
Common stock, shares issued 256,232,010 251,438,936
Common stock held in treasury, shares 10,005,795 1,808,133