|**Capital Stock (Tables)**                                                                     | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|**Equity [Abstract]**                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Schedule of Changes in Outstanding Common Stock                                                | Changes in outstanding common stock were as follows:(In thousands of shares)202320222021Outstanding, beginning of year111,452109,331107,588Shares issued for exercise of options———Shares issued for time vested restricted stock (net of forfeitures)1291,9181,368Shares issued for employee stock purchase plan88203375Outstanding, end of year111,669111,452109,331                                                                               
|                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|(In thousands of shares)                                                                       | 2023                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Outstanding, beginning of year                                                                 | 111,452                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Shares issued for exercise of options                                                          | —                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Shares issued for time vested restricted stock (net of forfeitures)                            | 129                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Shares issued for employee stock purchase plan                                                 | 88                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Outstanding, end of year                                                                       | 111,669                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Schedule of Changes in Treasury Stock                                                          | Changes in treasury stock were as follows:(In thousands of shares)202320222021Outstanding, beginning of year21,75116,98116,781Shares purchased under our Repurchase Program6,5234,438—Shares purchased for employee stock options, restricted stock and employee stock purchase plan577592419Shares reissued for employee stock options, restricted stock and employee stock purchase plan(2,379)(260)(219)Outstanding, end of year26,47221,75116,981
|                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|(In thousands of shares)                                                                       | 2023                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Outstanding, beginning of year                                                                 | 21,751                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Shares purchased under our Repurchase Program                                                  | 6,523                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Shares purchased for employee stock options, restricted stock and employee stock purchase plan | 577                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Shares reissued for employee stock options, restricted stock and employee stock purchase plan  | (2,379)                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Outstanding, end of year                                                                       | 26,472                                                                                                                                                                                                                                                                                                                                                                                                                                               

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