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Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Customer receivables, allowances $ 9,279 $ 9,913
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 140,000,000 140,000,000
Common stock, shares outstanding 79,884,372 81,231,131