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Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 1,800
Post-Retirement Health Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 233
Service cost $ 9 $ 10  
Interest cost 36 33  
Expected return on plan assets 0 0  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0  
Net amortization of net (gain) loss (4) 0  
Net Periodic Benefit Cost 41 43  
Defined Benefit Plan, Plan Assets, Contributions by Employer 56    
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 304 347  
Interest cost 866 798  
Expected return on plan assets (896) (991)  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0  
Net amortization of net (gain) loss 389 362  
Net Periodic Benefit Cost 663 $ 516  
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 391