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Employee Benefit Plans 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amounts recognized on the balance sheets:      
Non-current liabilities $ (61,365) $ (95,639)  
Pension Benefits      
Amounts recognized on the balance sheets:      
Non-current assets 0 0  
Current liabilities 0 0  
Non-current liabilities (26,227) (59,639)  
Net amount recognized (26,227) (59,639)  
Amounts recognized in regulatory assets consist of:      
Prior service cost (credit) 2,323 2,757  
Net (gain) loss 23,368 57,716  
Regulatory assets (liabilities) 25,691 60,473 $ 40,500
Unfunded accrued pension cost 536 (834)  
Net liability (asset) recognized 26,227 59,639  
Changes in plan assets and benefit obligations recognized in regulatory assets:      
Regulatory asset at beginning of year 60,473 40,500  
Net loss (gain) (30,531) 22,343  
New prior service cost 0 0  
Amortization of prior service (cost) credit (434) (435)  
Amortization of net gain (loss) (3,817) (1,935)  
Total change in regulatory asset (34,782) 19,973  
Regulatory asset (liability) at end of year 25,691 60,473 40,500
Net periodic pension costs 4,859 4,010 $ 4,447
Change in regulatory asset (34,782) 19,973  
Total recognized in net periodic pension cost and regulatory asset (liability) (29,923) 23,983  
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:      
Projected benefit obligation 259,751 272,786  
Accumulated benefit obligation 243,412 253,108  
Fair value of plan assets $ 233,524 $ 213,147  
Weighted-average assumptions used to determine benefit obligations at December 31:      
Discount rate 2.89% 2.55%  
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 $ 11,087 $ 6,407  
Current liabilities 0 0  
Non-current liabilities 0 0  
Net amount recognized 11,087 6,407  
Amounts recognized in regulatory assets consist of:      
Prior service cost (credit) 0 0  
Net (gain) loss (9,839) (6,855)  
Regulatory assets (liabilities) (9,839) (6,855) $ (5,432)
Unfunded accrued pension cost (1,248) 448  
Net liability (asset) recognized (11,087) (6,407)  
Changes in plan assets and benefit obligations recognized in regulatory assets:      
Regulatory asset at beginning of year (6,855) (5,432)  
Net loss (gain) (4,401) (2,400)  
New prior service cost 0 0  
Amortization of prior service (cost) credit 0 0  
Amortization of net gain (loss) 1,417 977  
Total change in regulatory asset (2,984) (1,423)  
Regulatory asset (liability) at end of year (9,839) (6,855) (5,432)
Net periodic pension costs (1,695) (1,108) $ (779)
Change in regulatory asset (2,984) (1,423)  
Total recognized in net periodic pension cost and regulatory asset (liability) (4,679) (2,531)  
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:      
Projected benefit obligation 2,686 5,906  
Fair value of plan assets $ 13,773 $ 12,313  
Weighted-average assumptions used to determine benefit obligations at December 31:      
Discount rate 2.46% 2.20%