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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2019
Stockholders' Equity [Abstract]  
Schedule of Treasury Stock by Class [Table Text Block]
Year Ended December 31,
201920182017
DollarDollarDollar
Shares AmountShares AmountShares Amount
(In thousands, except shares data)
Beginning of year $ 8,591,310 $ 103,6338,678,427 $ 104,5028,711,025 $ 104,860
Common shares used upon lapse of restricted stock units and options(105,032)(1,294)(87,117)(869)(32,598)(358)
End of year $ 8,486,278 $ 102,3398,591,310 $ 103,6338,678,427 $ 104,502