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Capital Stock - (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Capital Stock Disclosure | Common stock activity is summarized as follows:
| Three Months Ended March 31, 2019 |  | Three Months Ended March 31, 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 | 2,745 |  |  | — |  |  | 5,606 |  |  | — |
Restricted and performance stock awards | (2,411 | ) |  | 2,411 |  |  | (1,102 | ) |  | 1,102 |
Stock options exercised | 959 |  |  | 506 |  |  | 545 |  |  | 302 |
Treasury shares purchased | — |  |  | (7,446 | ) |  | — |  |  | (2,673 | )
Balance at end of period | 213,099 |  |  | (300,919 | ) |  | 200,002 |  |  | (297,350 | )

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