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Capital Stock - (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Capital Stock Disclosure | Common stock activity is summarized as follows:
| Three Months Ended September 30, 2020 |  | Three Months Ended September 30, 2019
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 233,786 |  |  | $ | (327,997) |  |  | $ | 218,801 |  |  | $ | (303,744) |
Stock compensation expense | (1,309) |  |  | — |  |  | 4,044 |  |  | — |
Restricted and performance stock awards | (50) |  |  | 50 |  |  | (70) |  |  | 70 |
Stock options exercised | 2,276 |  |  | 954 |  |  | 637 |  |  | 292 |
Treasury shares purchased | — |  |  | (439) |  |  | — |  |  | (118) |
Balance at end of period | $ | 234,703 |  |  | $ | (327,432) |  |  | $ | 223,412 |  |  | $ | (303,500) |
| Nine Months Ended September 30, 2020 |  | Nine Months Ended September 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 | 3,042 |  |  | — |  |  | 10,130 |  |  | — |
Restricted and performance stock awards | (2,513) |  |  | 2,513 |  |  | (2,713) |  |  | 2,713 |
Stock options exercised | 4,709 |  |  | 2,260 |  |  | 2,967 |  |  | 1,194 |
Treasury shares purchased | — |  |  | (8,578) |  |  | — |  |  | (7,713) |
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 | $ | 234,703 |  |  | $ | (327,432) |  |  | $ | 223,412 |  |  | $ | (303,500) |

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