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Capital Stock - (Tables)
 3 Months Ended
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
)