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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity [Abstract] |
Schedule of Treasury Stock by Class [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
|  |  | Dollar |  |  |  | Dollar |  |  |  | Dollar
| Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
| (In thousands, except shares data)
Beginning of period | 8,678,427 |  | $ | 104,502 |  | 8,711,025 |  | $ | 104,860 |  | 8,757,960 |  | $ | 105,379
Common shares used upon lapse of restricted stock units | (87,117) |  |  | (869) |  | (32,598) |  |  | (358) |  | (46,935) |  |  | (519)
End of period | 8,591,310 |  | $ | 103,633 |  | 8,678,427 |  | $ | 104,502 |  | 8,711,025 |  | $ | 104,860

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