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Employee Benefit Plans 14 (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)  
SERP      
Amounts recognized on the balance sheets:      
Current liabilities (949) (602)  
Non-current liabilities (35,140) (36,000)  
Net amount recognized (36,089) (36,602)  
Amounts recognized in regulatory assets consist of:      
Prior service cost (credit) 0 0  
Net loss 9,097 12,988  
Regulatory assets (liabilities) 9,097 12,988 $ 8,352
Unfunded accrued cost 26,992 23,614  
Net liability (asset) recognized 36,089 36,602  
Changes in plan assets and benefit obligations recognized in regulatory assets:      
Regulatory asset at beginning of year 12,988 8,352  
Net (gain) loss (2,213) 5,479  
Amortization of prior service credit 0 0  
Amortization of net loss (1,678) (843)  
Total change in regulatory asset (3,891) 4,636  
Regulatory asset (liability) at end of year 9,097 12,988 8,352
Net periodic pension costs 3,985 2,860 2,733
Change in regulatory asset (3,891) 4,636  
Total recognized in net periodic pension cost and regulatory asset (liability) 94 7,496  
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:      
Projected benefit obligation 36,089 36,602 $ 29,703
Accumulated benefit obligation 31,835 30,428  
Fair value of plan assets $ 0 $ 0  
Weighted-average assumptions used to determine benefit obligations at December 31:      
Discount rate 2.87% 2.52%  
Rate of compensation increase   4.00%  
SERP | Maximum      
Weighted-average assumptions used to determine benefit obligations at December 31:      
Rate of compensation increase 4.50%    
SERP | Minimum      
Weighted-average assumptions used to determine benefit obligations at December 31:      
Rate of compensation increase 4.00%