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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 12,122 $ 6,516
Long-term debt, debt discount and issuance costs $ 7,860 $ 8,460
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 400,000,000 400,000,000
Common stock, issued 270,569,043 269,372,257
Common stock, outstanding 187,241,124 192,035,870
Treasury stock, shares 83,327,919 77,336,387