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Benefit Plans (Details Textuals) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Pension Plans, Defined Benefit [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Contribution to benefit plan | $ 3,700
Expected contribution to benefit plans for remainder of fiscal year | 100
Postretirement Health Coverage [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Contribution to benefit plan | 165
Expected contribution to benefit plans for remainder of fiscal year | $ 55

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