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Employee Benefit Plans 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized on the balance sheets:            
Non-current liabilities       $ (95,639) $ (68,469)  
Pension Benefits            
Amounts recognized on the balance sheets:            
Non-current assets       0 0  
Current liabilities       0 0  
Non-current liabilities       (59,639) (39,375)  
Net amount recognized       (59,639) (39,375)  
Amounts recognized in regulatory assets consist of:            
Prior service cost (credit)       2,757 3,191  
Net (gain) loss       57,716 37,309  
Regulatory assets (liabilities) $ 60,473 $ 35,213 $ 35,213 60,473 40,500 $ 35,213
Unfunded accrued pension cost       (834) (1,125)  
Net liability (asset) recognized       59,639 39,375  
Changes in plan assets and benefit obligations recognized in regulatory assets:            
Regulatory asset at beginning of year 40,500 35,213        
Net loss (gain) (22,343) (7,140)        
New prior service cost 0 0        
Amortization of prior service (cost) credit (435) (434)        
Amortization of net gain (loss) (1,935) (1,419)        
Total change in regulatory asset 19,973 5,287        
Regulatory asset (liability) at end of year 60,473 40,500 35,213      
Net periodic pension costs 4,010 4,447 3,070      
Change in regulatory asset 19,973 5,287        
Total recognized in net periodic pension cost and regulatory asset (liability) 23,983 9,734        
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:            
Projected benefit obligation       272,786 231,852  
Accumulated benefit obligation       253,108 215,996  
Fair value of plan assets       $ 213,147 $ 192,477  
Weighted-average assumptions used to determine benefit obligations at December 31:            
Discount rate       2.55% 3.43%  
Pension Benefits | Minimum            
Weighted-average assumptions used to determine benefit obligations at December 31:            
Rate of compensation increase       3.00% 3.00% 3.00%
Pension Benefits | Maximum            
Weighted-average assumptions used to determine benefit obligations at December 31:            
Rate of compensation increase       8.00% 8.00% 8.00%
Post-Retirement Medical Benefits            
Amounts recognized on the balance sheets:            
Non-current assets       $ 6,407 $ 3,876  
Current liabilities       0 0  
Non-current liabilities       0 0  
Net amount recognized       6,407 3,876  
Amounts recognized in regulatory assets consist of:            
Prior service cost (credit)       0 0  
Net (gain) loss       (6,855) (5,432)  
Regulatory assets (liabilities) (5,432) (5,432) (4,459) (6,855) (5,432) $ (4,459)
Unfunded accrued pension cost       448 1,556  
Net liability (asset) recognized       (6,407) (3,876)  
Changes in plan assets and benefit obligations recognized in regulatory assets:            
Regulatory asset at beginning of year (5,432) (4,459)        
Net loss (gain) 2,400 1,775        
New prior service cost 0 0        
Amortization of prior service (cost) credit 0 0        
Amortization of net gain (loss) 977 802        
Total change in regulatory asset (1,423) (973)        
Regulatory asset (liability) at end of year (6,855) (5,432) (4,459)      
Net periodic pension costs (1,108) (779) $ (752)      
Change in regulatory asset (1,423) (973)        
Total recognized in net periodic pension cost and regulatory asset (liability) $ (2,531) $ (1,752)        
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:            
Projected benefit obligation       5,906 7,395  
Fair value of plan assets       $ 12,313 $ 11,271  
Weighted-average assumptions used to determine benefit obligations at December 31:            
Discount rate       2.20% 3.12%