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Capital Stock - (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Capital Stock Disclosure | Common stock activity is summarized as follows:
| Three Months Ended September 30, 2019 |  | Three Months Ended September 30, 2018
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 218,801 |  |  | $ | (303,744 | ) |  | $ | 204,171 |  |  | $ | (296,870 | )
Stock compensation expense | 4,044 |  |  | — |  |  | 1,904 |  |  | — |
Restricted and performance stock awards | (70 | ) |  | 70 |  |  | (93 | ) |  | 93 |
Stock options exercised | 637 |  |  | 292 |  |  | 1,333 |  |  | 528 |
Treasury shares purchased | — |  |  | (118 | ) |  | — |  |  | (464 | )
Balance at end of period | $ | 223,412 |  |  | $ | (303,500 | ) |  | $ | 207,315 |  |  | $ | (296,713 | )
| Nine Months Ended September 30, 2019 |  | Nine Months Ended September 30, 2018
(In thousands) | Common Stock |  | Treasury Cost |  | Common Stock |  | Treasury Cost
Balance at beginning of period | $ | 211,806 |  |  | $ | (296,390 | ) |  | $ | 194,953 |  |  | $ | (296,081 | )
Stock compensation expense | 10,130 |  |  | — |  |  | 9,595 |  |  | — |
Restricted and performance stock awards | (2,713 | ) |  | 2,713 |  |  | (1,594 | ) |  | 1,594 |
Stock options exercised | 2,967 |  |  | 1,194 |  |  | 4,124 |  |  | 2,030 |
Treasury shares purchased | — |  |  | (7,713 | ) |  | — |  |  | (4,299 | )
Stock consideration in acquisition (Note 19) | 921 |  |  | — |  |  | — |  |  | — |
Employee stock purchase program | 301 |  |  | 43 |  |  | 237 |  |  | 43 |
Share repurchase program | — |  |  | (3,347 | ) |  | — |  |  | — |
Balance at end of period | $ | 223,412 |  |  | $ | (303,500 | ) |  | $ | 207,315 |  |  | $ | (296,713 | )

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