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Capital Stock - (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Capital Stock Disclosure | Common stock activity is summarized as follows:
| Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 242,693 |  |  | $ | (326,156) |  |  | $ | 229,127 |  |  | $ | (303,566) |
Stock compensation expense | 3,293 |  |  | — |  |  | 3,522 |  |  | — |
Restricted and performance stock awards | (1,333) |  |  | 1,333 |  |  | (2,239) |  |  | 2,239 |
Stock options exercised | 1,234 |  |  | 556 |  |  | 1,757 |  |  | 976 |
Treasury shares purchased | — |  |  | (5,348) |  |  | — |  |  | (7,617) |
Share repurchase program | — |  |  | — |  |  | — |  |  | (20,113) |
Balance at end of period | $ | 245,887 |  |  | $ | (329,615) |  |  | $ | 232,167 |  |  | $ | (328,081) |

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