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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Trade accounts receivable, allowances | $ 2,728 | $ 1,820 | $ 2,873
Treasury stock, shares | 90,000 | 88,000 | 88,000
Common Stock |  |  |
Common stock, par value (in dollars per share) | $ 0.6944 | $ 0.6944 | $ 0.6944
Common stock, shares authorized | 120,000,000 | 120,000,000 | 120,000,000
Common stock, shares issued | 39,019,000 | 38,544,000 | 38,621,000
Class B Common Stock |  |  |
Common stock, par value (in dollars per share) | $ 0.6944 | $ 0.6944 | $ 0.6944
Common stock, shares authorized | 40,000,000 | 40,000,000 | 40,000,000
Common stock, shares issued | 26,300,000 | 25,584,000 | 25,599,000

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