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Consolidated Statements of Stockholders' Equity (Parenthetical) | 12 Months Ended
--- | ---
Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 $ / shares shares | Dec. 31, 2013 $ / shares shares
Dividend reinvestment plan, shares | 50,013 | 58,309 | 63,349
Stock purchase and compensation plans, shares | 863,426 | 769,389 | 862,662
Dividends to stockholders, per share | $ / shares | $ 0.57 | $ 0.53 | $ 0.52
Acquisition of treasury stock, shares | 147,461 | 154,559 | 167,846
Preferred stock, par value per share | $ / shares | $ 0 | $ 0 | $ 0
Preferred stock, shares authorized | 5,000,000 | 5,000,000 | 5,000,000
Preferred stock, shares issued | 0 | 0 | 0
Series A Preferred Stock [Member] |  |  |
Preferred stock, par value per share | $ / shares | $ 0 | $ 0 | $ 0
Preferred stock, shares authorized | 300,000 | 300,000 | 300,000

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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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