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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Trade accounts receivable, allowances $ 4,303 $ 3,719
Preferred Stock, par value (in dollars per share) $ 0
Preferred Stock, authorized shares (in shares) 15,000,000 15,000,000
Preferred Stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 240,000,000 240,000,000
Common stock, shares issued (in shares) 88,735,000 88,044,000
Treasury stock, shares (in shares) 2,865,000 2,881,000