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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2025
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block] Average shares used in computing the basic and diluted earnings per share are as follows:
Three Months Ended
June 30, 2025June 30, 2024
Basic computation61,380,777 61,288,870 
Dilutive effect of:
Performance share awards(1)
103,169 68,478 
Diluted computation61,483,946 61,357,348 
(1) Performance share awards are included in diluted weighted average number of shares outstanding based upon what would be issued if the end of the most recent reporting period was the end of the term of the award.
Six Months Ended
June 30, 2025June 30, 2024
Basic computation61,360,252 61,277,418 
  Dilutive effect of: 
Performance share awards(1)
95,733 56,065 
Diluted computation61,455,985 61,333,483