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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of shares of common stock issued under stock option plan | 97,471 | 104,277 | 167,675
Number of common stock shares purchased | 205,983 | 76,790 | 43,835
Common stock | $ 0.93 | $ 0.86 | $ 0.78
Common Stock [Member] |  |  |
Number of shares of common stock issued under stock option plan | 97,471 | 104,277 | 167,675
Additional Paid-in Capital [Member] |  |  |
Number of shares of common stock issued under stock option plan | 97,471 | 104,277 | 167,675
Treasury Stock [Member] |  |  |
Number of common stock shares purchased | 205,983 | 76,790 | 43,835

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