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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Trade accounts receivable, allowances | $ 1,887 | $ 1,949 | $ 1,696
Treasury stock, shares | 93,000 | 90,000 | 90,000
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 | 39,769,000 | 38,836,000 | 39,418,000
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 | 27,037,000 | 26,287,000 | 26,342,000

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