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

Total number of common shares of the Company that have been issued to shareholders during the period.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of the related income tax effect of a cumulative effect on retained earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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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

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