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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Stockholders' Equity [Abstract] |
Activity of Common Shares Held in Treasury |
|  | Quarter Ended March 31,
|  | 2021 |  | 2020
|  |  |  | Dollar |  |  |  | Dollar
|  | Shares |  | Amount |  | Shares |  | Amount
|  | (In thousands, except shares data)
Beginning of period | $ | 8,498,163 |  | $ | 102,949 |  | 8,486,278 |  | $ | 102,339
Common shares used upon lapse of restricted stock units and options |  | (192,174) |  |  | (1,955) |  | (103,042) |  |  | (1,276)
Common shares repurchased as part of the stock repurchase program |  | - |  |  | - |  | 175,000 |  |  | 2,226
End of period | $ | 8,305,989 |  | $ | 100,994 |  | 8,558,236 |  | $ | 103,289

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