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Benefit Plans (Details Textuals)
$ in Thousands
3 Months Ended
Sep. 30, 2018
USD ($)
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Contribution to benefit plan $ 2,400
Expected contribution to benefit plans for remainder of fiscal year 900
Postretirement Health Coverage [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Contribution to benefit plan 55
Expected contribution to benefit plans for remainder of fiscal year $ 165