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Business Description And Significant Accounting Policies: Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income available for common stock	$ 227,608	$ 199,310	$ 258,442
Weighted average shares - Basic (in shares)	62,378	60,662	54,420
Dilutive effect of:
Equity Units (in shares)	0	0	898
Equity compensation (in shares)	61	136	168
Weighted average shares - diluted (in shares)	62,439	60,798	55,486
Total earnings (loss) per share of common stock, Diluted (usd per share)	$ 3.65	$ 3.28	$ 4.66

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