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Earnings Per Share: Earnings Per Share Reconciliation (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income available for common stock $ 21,917 $ 22,195 $ 154,921 $ 98,718
Weighted average shares - basic (in shares) 53,355 53,229 53,337 53,191
Dilutive effect of:        
Equity Units (in shares) 1,057 1,977 904 1,796
Equity compensation (in shares) 108 178 120 192
Weighted average shares - diluted (in shares) 54,520 55,384 54,361 55,179