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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Issuance of common shares under stock based compensation awards, including related tax effects | 91,340 | 94,361 | [1]
Common stock acquired for treasury | 269,667 | 104,661 | [1]
Common stock dividend (in dollars per share) | $ 0.18 | $ 0.164 | [2]
[1] | *Share and per share data gives retrospective recognition to a 10% stock dividend declared on July 22, 2015 and issued on August 14, 2015.
[2] | *The computation of three months ended March 31, 2015 per common share data and shares outstanding gives retrospective recognition to a 10% stock dividend declared on July 22, 2015 and issued on August 14, 2015.

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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 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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