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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income available for common stock	$ 44,112	$ 36,283	$ 165,589	$ 150,423
Weighted average shares - basic (in shares)	63,341	62,575	62,950	62,310
Dilutive effect of:
Equity compensation (in shares)	95	55	96	52
Weighted average shares - diluted (in shares)	63,436	62,630	63,046	62,362
Earnings per share, Basic (usd per share)	$ 0.70	$ 0.58	$ 2.63	$ 2.41
Earnings per share, Diluted (usd per share)	$ 0.70	$ 0.58	$ 2.63	$ 2.41

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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-Section 45
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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