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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2022
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
September 30, 2022September 30, 2021
Basic computation56,310,526 51,891,557 
  Dilutive effect of:
Performance share awards(1)
14,306 136,865 
Forward equity sale(2)
312,572 — 
Diluted computation56,637,404 52,028,422 

Nine Months Ended
September 30, 2022September 30, 2021
Basic computation54,901,161 51,175,345 
  Dilutive effect of: 
Performance share awards(1)
20,150 136,995 
Forward equity sale(2)
619,361 — 
Diluted computation55,540,672 51,312,340 
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(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.

(2)          Forward equity shares 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 forward sale agreement.