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Capital Stock - (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Common Stock Activity | Common stock activity is summarized as follows:
| Three Months Ended June 30, 2021 |  | Three Months Ended June 30, 2020
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 245,887 |  |  | $ | (329,615) |  |  | $ | 232,167 |  |  | $ | (328,081) |
Stock compensation expense | 7,403 |  |  | — |  |  | 830 |  |  | — |
Restricted and performance stock awards | (170) |  |  | 170 |  |  | (226) |  |  | 226 |
Stock options exercised | 244 |  |  | 126 |  |  | 677 |  |  | 330 |
Treasury shares purchased | — |  |  | (163) |  |  | — |  |  | (524) |
Employee stock purchase program | 409 |  |  | 43 |  |  | 338 |  |  | 52 |
Balance at end of period | $ | 253,773 |  |  | $ | (329,439) |  |  | $ | 233,786 |  |  | $ | (327,997) |
| Six Months Ended June 30, 2021 |  | Six Months Ended June 30, 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 | 10,695 |  |  | — |  |  | 4,352 |  |  | — |
Restricted and performance stock awards | (1,502) |  |  | 1,502 |  |  | (2,464) |  |  | 2,464 |
Stock options exercised | 1,478 |  |  | 683 |  |  | 2,433 |  |  | 1,307 |
Treasury shares purchased | — |  |  | (5,511) |  |  | — |  |  | (8,141) |
Employee stock purchase program | 409 |  |  | 43 |  |  | 338 |  |  | 52 |
Share repurchase program | — |  |  | — |  |  | — |  |  | (20,113) |
Balance at end of period | $ | 253,773 |  |  | $ | (329,439) |  |  | 233,786 |  |  | (327,997) |

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