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Components of Net Periodic Benefit Cost (Details Textual) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 2,700
Defined Benefit Plan, Expected Future Benefit Payments, Next Rolling Twelve Months     1,100
Defined Contribution Plan Employer Accrued Discretionary Contribution Amount $ 1,200 $ 1,100  
Post Retirement Health Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year     $ 262
Defined Benefit Plan, Contributions by Employer 151    
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Contributions by Employer $ 2,100