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Business Segment Information: Segment and Corporate Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 7,081,453 $ 6,963,327
Changes To Our Segment Performance Measure - Assets 0  
Corporate    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 216,179 209,478
Electric Utilities    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 2,777,803 2,707,695
Gas Utilities    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,645,840 3,623,475
Power Generation    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 379,140 342,085
Mining    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 62,491 80,594
Recasting of Intercompany Capital Lease    
Segment Reporting, Asset Reconciling Item [Line Items]    
Changes To Our Segment Performance Measure - Assets   0
Recasting of Intercompany Capital Lease | Electric Utilities    
Segment Reporting, Asset Reconciling Item [Line Items]    
Changes To Our Segment Performance Measure - Assets   (188,000)
Recasting of Intercompany Capital Lease | Power Generation    
Segment Reporting, Asset Reconciling Item [Line Items]    
Changes To Our Segment Performance Measure - Assets   $ 188,000