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Capital Stock and Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Common Shares Share information regarding the Company's common stock at December 31, was as follows:
20202019
Common stock shares:
Authorized800,000,000 800,000,000 
Issued168,503,526 182,816,536 
Outstanding152,930,740 152,468,442 
Treasury stock shares15,572,786 30,348,094 
Reconciliation of Earnings Per Share Basic and Diluted The computation of basic and diluted earnings per share for the years ended December 31, was as follows (in thousands except per share amounts): 
202020192018
Net income$1,298 $423,635 $531,451 
Basic weighted-average shares outstanding153,186 157,054 165,672 
Effect of dilutive securities – employee stock compensation plan722 750 832 
Diluted weighted-average shares outstanding153,908 157,804 166,504 
Earnings per share:
Basic$0.01 $2.70 $3.21 
Diluted$0.01 $2.68 $3.19