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Employee Benefit Plans Employee Benefit Plans 14 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized on the balance sheets:            
Non-current liabilities       $ 57,636 $ 57,695  
SERP            
Amounts recognized on the balance sheets:            
Current liabilities       (433) (409)  
Non-current liabilities       24,084 23,653  
Net amount recognized       (24,517) (24,062)  
Amounts recognized in regulatory assets consist of:            
Prior service cost (credit)       0 0  
Net loss       5,403 7,556  
Regulatory assets (liabilities) $ 7,556 $ 6,474 $ 6,474 5,403 7,556 $ 6,474
Unfunded accrued pension cost       19,114 16,506  
Net liability (asset) recognized       24,517 24,062  
Changes in plan assets and benefit obligations recognized in regulatory assets:            
Regulatory asset at beginning of year 7,556 6,474        
Net (gain) loss (1,104) 1,872        
Amortization of prior service (cost) credit 0 (12)        
Amortization of net gain (loss) (1,049) (778)        
Change in regulatory asset (2,153) 1,082        
Regulatory asset (liability) at end of year 5,403 7,556 6,474      
Net periodic pension costs 3,033 2,612 $ 1,859      
Change in regulatory asset (2,153) 1,082        
Total recognized in net periodic pension cost and regulatory asset (liability) 880 3,694        
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:            
Initial net asset (obligation) 0 0        
Prior service cost 0 0        
Net gain (loss) $ (471) $ (1,049)        
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:            
Projected benefit obligation       24,517 24,062 $ 20,783
Accumulated benefit obligation       21,229 20,742  
Fair value of plan assets       $ 0 $ 0  
Weighted-average assumptions used to determine benefit obligations at December 31:            
Discount rate       4.40% 3.72%  
Rate of compensation increase       4.00% 4.00%