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Income Taxes Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Effective Tax Rate Reconciliation [Line Items]            
Regulatory liabilities $ 43,442     $ 43,442   $ 113,209
Federal income taxes at statutory rates $ 1,041   $ 2,452 $ 36,554 $ 22,721  
Federal income taxes at statutory rates 21.00%   21.00% 21.00% 21.00%  
Tax effect of regulatory treatment of utility plant differences $ (2,139)   $ (1,521) $ (6,358) $ (4,519)  
Tax effect of regulatory treatment of utility plant differences (43.10%)   (13.00%) (3.70%) (4.20%)  
State income tax expense $ (800)   $ (319) $ 851 $ 694  
State income tax expense (16.10%)   (2.70%) 0.50% 0.60%  
Settlement of Prior Year Tax Returns, amount $ (604)   $ (136) $ 1,995 $ (136)  
Settlement of Prior Year Tax Return, Percent (12.20%)   (1.10%) 1.10% (0.10%)  
Acquisition costs $ 0   $ 122 $ (1,712) $ 241  
Acquisition costs 0.00%   1.00% (1.00%) 0.20%  
Non-plant excess deferred turnaround $ (20) $ (5,100) $ 0 $ (5,621) $ 0  
Non-plant excess deferred turnaround (0.40%)   0.00% (3.20%) 0.00%  
Tax loss on sale of METALfx $ (13)   $ 0 $ (1,272) $ 0  
Tax loss on sale of METALfx (0.20%)   0.00% (0.70%) 0.00%  
Valuation allowance $ 0   $ 0 $ 1,245 $ 0  
Valuation allowance 0.00%   0.00% 0.70% 0.00%  
Settlement of equity awards $ 0   $ 0 $ 612 $ (990)  
Settlement of equity awards 0.00%   0.00% 0.40% (0.90%)  
Other $ 2,404   $ 950 $ 1,851 $ (544)  
Other 48.40%   8.10% 1.10% (0.50%)  
Income Tax Expense (Benefit) $ (131)   $ 1,548 $ 28,145 $ 17,467  
Effective Income Tax Rate (2.60%)   13.30% 16.20% 16.10%  
Income Tax Related            
Effective Tax Rate Reconciliation [Line Items]            
Regulatory liabilities $ 23,409     $ 23,409   $ 27,997
Income Tax Related | IDAHO            
Effective Tax Rate Reconciliation [Line Items]            
Regulatory liabilities $ 6,400     $ 6,400