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CONSOLIDATED STATEMENTS OF Financial Position (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Trade accounts receivable, allowances | $ 2,225 | $ 1,968
Treasury stock, shares | 80 | 78
Common Stock |  |
Common stock, par value (in dollars per share) | $ 0.6944 | $ 0.6944
Common stock, shares authorized | 120,000 | 120,000
Common stock, shares issued | 37,382 | 37,285
Class B Common Stock |  |
Common stock, par value (in dollars per share) | $ 0.6944 | $ 0.6944
Common stock, shares authorized | 40,000 | 40,000
Common stock, shares issued | 23,542 | 22,887

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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