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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income available for common stock	$ 36,283	$ 11,740	$ 150,423	$ 130,131
Weighted average shares - basic (in shares)	62,575	60,976	62,310	60,458
Dilutive effect of:
Equity compensation (in shares)	55	128	52	120
Weighted average shares - diluted (in shares)	62,630	61,104	62,362	60,578
Earnings (loss) per share, Basic (usd per share)	$ 0.58	$ 0.19	$ 2.41	$ 2.15
Earnings (loss) per share, Diluted (usd per share)	$ 0.58	$ 0.19	$ 2.41	$ 2.15

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