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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity [Abstract] |
Schedule of Treasury Stock by Class [Table Text Block] |
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  |  |  | Dollar |  |  |  | Dollar |  |  |  | Dollar
|  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
|  | (In thousands, except shares data)
Beginning of year | $ | 8,591,310 |  | $ | 103,633 |  | 8,678,427 |  | $ | 104,502 |  | 8,711,025 |  | $ | 104,860
Common shares used upon lapse of restricted stock units and options |  | (105,032) |  |  | (1,294) |  | (87,117) |  |  | (869) |  | (32,598) |  |  | (358)
End of year | $ | 8,486,278 |  | $ | 102,339 |  | 8,591,310 |  | $ | 103,633 |  | 8,678,427 |  | $ | 104,502

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