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Earnings Per Share: Earnings Per Share Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net income available for common stock $ 34,973 $ 44,112 $ 185,914 $ 165,589
Weighted average shares - basic (in shares) 64,876 63,341 64,722 62,950
Dilutive effect of:        
Equity compensation (in shares) 185 95 188 96
Weighted average shares - diluted (in shares) 65,061 63,436 64,910 63,046
Earnings per share, Basic (usd per share) $ 0.54 $ 0.70 $ 2.87 $ 2.63
Earnings per share, Diluted (usd per share) $ 0.54 $ 0.70 $ 2.86 $ 2.63