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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 7,571 $ 6,516
Long-term debt, debt discount and issuance costs $ 8,232 $ 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 269,523,313 269,372,257
Common stock, outstanding 186,357,521 192,035,870
Treasury stock, shares 83,165,792 77,336,387