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Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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 $ 17 $ 21  
Interest cost 36 33 73 65  
Expected return on plan assets 0 0 0 0  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 0 0  
Net amortization of net (gain) loss (4) 0 (8) 0  
Net Periodic Benefit Cost 41 43 82 86  
Defined Benefit Plan, Plan Assets, Contributions by Employer     126    
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 304 347 609 694  
Interest cost 866 798 1,733 1,597  
Expected return on plan assets (896) (991) (1,793) (1,981)  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 0 0  
Net amortization of net (gain) loss 390 362 779 723  
Net Periodic Benefit Cost $ 664 $ 516 1,328 $ 1,033  
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 897