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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Trade accounts receivable, allowances | $ 2,260 | $ 1,949 | $ 2,728
Treasury stock, shares | 93 | 90 | 90
Common Stock |  |  |
Common stock, par value (in dollars per share) | $ 0.6944 | $ 0.6944 | $ 0.6944
Common stock, shares authorized | 120,000 | 120,000 | 120,000
Common stock, shares issued | 39,336 | 38,836 | 39,019
Class B Common Stock |  |  |
Common stock, par value (in dollars per share) | $ 0.6944 | $ 0.6944 | $ 0.6944
Common stock, shares authorized | 40,000 | 40,000 | 40,000
Common stock, shares issued | 27,025 | 26,287 | 26,300

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