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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity [Abstract] |
Activity of Common Shares Held in Treasury |
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  |  | 2018 |  |  |
|  |  |  | Dollar |  |  |  | Dollar |  |  |  |  | Dollar
|  | Shares |  | Amount |  | Shares |  | Amount |  |  | Shares |  | Amount
|  | (In thousands, except shares data)
Beginning of year | $ | 8,486,278 |  | $ | 102,339 |  | 8,591,310 |  | $ | 103,633 |  | $ | 8,678,427 |  | $ | 104,502
Common shares used upon lapse of restricted stock units and options |  | (163,115) |  |  | (1,616) |  | (105,032) |  |  | (1,294) |  |  | (87,117) |  |  | (869)
Common shares repurchased as part of the stock repurchase program |  | 175,000 |  |  | 2,226 |  | - |  |  | - |  |  | - |  |  | -
End of year | $ | 8,498,163 |  | $ | 102,949 |  | 8,486,278 |  | $ | 102,339 |  | $ | 8,591,310 |  | $ | 103,633

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