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Earnings Per Share: Earnings Per Share Reconciliation (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net income available for common stock $ 11,740 $ 16,950 $ 130,131 $ 171,871
Weighted average shares - basic (in shares) 60,976 53,364 60,458 53,346
Dilutive effect of:        
Equity Units (in shares) 0 1,344 0 1,060
Equity compensation (in shares) 128 111 120 102
Weighted average shares - diluted (in shares) 61,104 54,819 60,578 54,508