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Capital Stock - (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Capital Stock Disclosure | Common stock activity is summarized as follows:
| Three Months Ended June 30, 2020 |  |  |  | Three Months Ended June 30, 2019 |  |
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 232,167 |  |  | $ | (328,081) |  |  | $ | 213,099 |  |  | $ | (300,919) |
Stock compensation expense | 830 |  |  | — |  |  | 3,340 |  |  | — |
Restricted and performance stock awards | (226) |  |  | 226 |  |  | (232) |  |  | 232 |
Stock options exercised | 677 |  |  | 330 |  |  | 1,372 |  |  | 395 |
Treasury shares purchased | — |  |  | (524) |  |  | — |  |  | (148) |
Stock consideration in acquisition | — |  |  | — |  |  | 921 |  |  | — |
Employee stock purchase program | 338 |  |  | 52 |  |  | 301 |  |  | 43 |
Share repurchase program | — |  |  | — |  |  | — |  |  | (3,347) |
Balance at end of period | $ | 233,786 |  |  | $ | (327,997) |  |  | $ | 218,801 |  |  | $ | (303,744) |
| Six Months Ended June 30, 2020 |  |  |  | Six Months Ended June 30, 2019 |  |
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 229,127 |  |  | $ | (303,566) |  |  | $ | 211,806 |  |  | $ | (296,390) |
Stock compensation expense | 4,352 |  |  | — |  |  | 6,086 |  |  | — |
Restricted and performance stock awards | (2,464) |  |  | 2,464 |  |  | (2,643) |  |  | 2,643 |
Stock options exercised | 2,433 |  |  | 1,307 |  |  | 2,330 |  |  | 902 |
Treasury shares purchased | — |  |  | (8,141) |  |  | — |  |  | (7,595) |
Stock consideration in acquisition | — |  |  | — |  |  | 921 |  |  | — |
Employee stock purchase program | 338 |  |  | 52 |  |  | 301 |  |  | 43 |
Share repurchase program | — |  |  | (20,113) |  |  | — |  |  | (3,347) |
Balance at end of period | $ | 233,786 |  |  | $ | (327,997) |  |  | $ | 218,801 |  |  | $ | (303,744) |

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