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Capital Stock - (Tables)
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Capital Stock Disclosure
Common stock activity is summarized as follows:
Three Months Ended March 31, 2021Three Months Ended March 31, 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 expense3,293 — 3,522 — 
Restricted and performance stock awards(1,333)1,333 (2,239)2,239 
Stock options exercised1,234 556 1,757 976 
Treasury shares purchased— (5,348)— (7,617)
Share repurchase program— — — (20,113)
Balance at end of period$245,887 $(329,615)$232,167 $(328,081)