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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of shares of common stock issued under stock option plan | 45,289 | 67,029 | 227,410
Number of common stock shares purchased | 41,915 | 154,633 | 60,595
Preferred stock |  |  | $ 1.375
Common stock | $ 0.73 | $ 0.69 | $ 0.65
Common Stock [Member] |  |  |
Number of shares of common stock issued under stock option plan | 45,289 | 67,029 | 227,410
Additional Paid-in Capital [Member] |  |  |
Number of shares of common stock issued under stock option plan | 45,289 | 67,029 | 227,410
Treasury Stock [Member] |  |  |
Number of common stock shares purchased | 41,915 | 154,633 | 60,595

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