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Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in balance sheets [Abstract]      
Current liabilities $ (366) $ (365)  
Noncurrent liabilities (7,028) (7,834)  
Total amount recognized in balance sheet (7,394) (8,199)  
Net actuarial loss recognized in accumulated other comprehensive income (loss) $ 1,063 1,968  
SERP [Member]      
Defined Benefit Plan [Abstract]      
Percentage of final average earnings to annual benefits 55.00%    
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of the year $ 8,199 7,674  
Interest cost 290 321 $ 341
Actuarial losses (gains) (769) 509  
Benefits paid (326) (305)  
Benefit obligation at end of year 7,394 8,199 7,674
Change in plan assets [Roll Forward]      
Employer contribution 326 305  
Benefits paid (326) (305)  
Fair value of plan assets at end of year 0 0  
Funded status of the plan - (underfunded) (7,394) (8,199)  
Accumulated benefit obligations 7,394 8,199  
Net pension cost [Abstract]      
Interest cost on projected benefit obligation 290 321 341
Amortization of actuarial loss 136 90 102
Net pension costs 426 $ 411 $ 443
SERP [Member] | Maximum [Member]      
Defined Benefit Plan [Abstract]      
Annual retirement benefits $ 125