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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward |
|  | Common Stock |  |
|  | Treasury |  | Outstanding
Share Activity |  | (Number of Shares) |  |
Balance at end of 2016 |  | 803,154 |  | 10,312,625
Issued for stock-based compensation plans |  | (27,951) |  | 27,951
Balance at end of 2017 |  | 775,203 |  | 10,340,576
Issued for stock-based compensation plans |  | (25,431) |  | 25,431
Balance at end of 2018 |  | 749,772 |  | 10,366,007

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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