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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 10,838 $ 10,842
Long-term debt, debt discount and issuance costs $ 7,066 $ 7,271
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 271,192,193 271,028,688
Common stock, outstanding 187,789,871 187,626,366
Treasury stock, shares 83,402,322 83,402,322