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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of Outstanding Shares of Common Stock | The following table summarizes outstanding shares of common stock:
| Year ended December 31 |
In thousands | 2017 |  |  |  | 2016 |  |  |  | 2015 |
Shares outstanding at beginning of year |  | 43,550 |  |  |  |  | 43,420 |  |  |  |  | 43,054 |
Treasury shares issued for: |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards |  | 28 |  |  |  |  | 108 |  |  |  |  | 206 |
401(k) plan |  | — |  |  |  |  | — |  |  |  |  | 134 |
Employee stock options exercised |  | 36 |  |  |  |  | 22 |  |  |  |  | 26 |
Shares outstanding at end of year |  | 43,614 |  |  |  |  | 43,550 |  |  |  |  | 43,420 |

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