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Consolidated Statements of Equity (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends declared, per common share (in dollars per share) | $ 0.6650 | $ 0.6450 | $ 0.6250
Additional Paid-in Capital |  |  |
Income tax on stock option exercise and other shares issued to employees and directors | $ (267) | $ (323) | $ 458
Stock option exercises and other shares issued to employees and directors, shares | 127 | 138 | 196
Retained Earnings |  |  |
Tax effect of adoption of new accounting standard | $ 3,492 |  |
Dividends declared, per common share (in dollars per share) | $ 0.665 | $ 0.645 | $ 0.6250

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- Definition The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=79981250&loc=d3e23586-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=79981250&loc=d3e23594-113945 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 + Details
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