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Employee Benefit Plans Employee Benefit Plans 14 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amounts recognized on the balance sheets:            
Non-current liabilities       $ 49,856 $ 42,666  
SERP            
Amounts recognized on the balance sheets:            
Current liabilities       419 411  
Non-current liabilities       20,364 15,906  
Net amount recognized       (20,783) (16,317)  
Amounts recognized in regulatory assets consist of:            
Prior service cost (credit)       11 36  
Net (gain) loss       (6,463) (3,416)  
Regulatory assets (liabilities) $ 3,452 $ 4,683 $ 4,683 6,474 3,452 $ 4,683
Unfunded accrued pension cost       (14,309) (12,865)  
Net liability (asset) recognized       20,783 16,317  
Changes in plan assets and benefit obligations recognized in regulatory assets:            
Regulatory asset at beginning of year 3,452 4,683        
Net loss (gain) (3,339) 683        
Amortization of prior service (cost) credit (25) (117)        
Amortization of net gain (loss) (292) (431)        
Total change in regulatory asset 3,022 (1,231)        
Regulatory asset (liability) at end of year 6,474 3,452 4,683      
Net periodic pension costs 1,859 2,015 $ 1,683      
Change in regulatory asset 3,022 (1,231)        
Total recognized in net periodic pension cost and regulatory asset (liability) 4,881 784        
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:            
Initial net asset (obligation) 0 0        
Prior service cost (11) (25)        
Net gain (loss) $ (777) $ (292)        
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:            
Projected benefit obligation       20,783 16,317 $ 15,926
Accumulated benefit obligation       17,144 14,533  
Fair value of plan assets       $ 0 $ 0  
Weighted-average assumptions used to determine benefit obligations at December 31:            
Discount rate       4.34% 4.61%  
Rate of compensation increase       4.00% 4.00%