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Employee Benefit Plans 14 (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)  
SERP            
Amounts recognized on the balance sheets:            
Current liabilities       (602) (609)  
Non-current liabilities       (36,000) (29,094)  
Net amount recognized       (36,602) (29,703)  
Amounts recognized in regulatory assets consist of:            
Prior service cost (credit)       0 0  
Net loss       12,988 8,352  
Regulatory assets (liabilities) $ 12,988 $ 5,403 $ 5,403 12,988 8,352 $ 5,403
Unfunded accrued pension cost       23,614 21,351  
Net liability (asset) recognized       36,602 29,703  
Changes in plan assets and benefit obligations recognized in regulatory assets:            
Regulatory asset at beginning of year 8,352 5,403        
Net (gain) loss 5,479 3,419        
Amortization of prior service (cost) credit 0 0        
Amortization of net gain (loss) (843) (470)        
Total change in regulatory asset 4,636 2,949        
Regulatory asset (liability) at end of year 12,988 8,352 5,403      
Net periodic pension costs 2,860 2,733 $ 3,033      
Change in regulatory asset 4,636 2,949        
Total recognized in net periodic pension cost and regulatory asset (liability) $ 7,496 $ 5,682        
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:            
Projected benefit obligation       36,602 29,703 $ 24,517
Accumulated benefit obligation       30,428 26,251  
Fair value of plan assets       $ 0 $ 0  
Weighted-average assumptions used to determine benefit obligations at December 31:            
Discount rate       2.52% 3.36%  
Rate of compensation increase       4.00% 4.00%