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Components of Net Periodic Benefit Cost (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 2,500
Defined Benefit Plan, Expected Future Benefit Payments, Next Rolling Twelve Months     900
Defined Contribution Plan Employer Accrued Discretionary Contribution Amount $ 500 $ 400  
Post Retirement Health Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 260
Defined Benefit Plan, Contributions by Employer 55    
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Contributions by Employer $ 400