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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Common Stock Outstanding Roll Forward |
|  | Common Stock
|  | Treasury |  | Outstanding
Share Activity |  | (Number of Shares)
Balance at end of 2014 |  | 873,374 |  |  | 10,242,405 |
Issued for stock-based compensation plans |  | (59,113 | ) |  | 59,113 |
Repurchased common stock |  | 80,512 |  |  | (80,512 | )
Balance at end of 2015 |  | 894,773 |  |  | 10,221,006 |
Issued for stock-based compensation plans |  | (96,619 | ) |  | 96,619 |
Repurchased common stock |  | 5,000 |  |  | (5,000 | )
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 |

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