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Components of Net Periodic Benefit Cost (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended
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
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year     814
Defined Contribution Plan Employer Accrued Discretionary Contribution Amount $ 726 $ 837  
Post Retirement Health Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 233
Defined Benefit Plan, Plan Assets, Contributions by Employer 126    
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 897