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Condensed Consolidated Statements of Equity (Parenthetical) (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Dividends declared, per common share | $ 0.165 | $ 0.16
Adoption of new accounting standard, tax | $ 2,869 |
Additional Paid-in Capital |  |
Income tax on stock option exercise and other shares issued to employees and directors | $ 0 | $ (323)
Stock option exercises and other shares issued to employees and directors, shares | 105 | 126
Retained Earnings |  |
Dividends declared, per common share | $ 0.165 | $ 0.16

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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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