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Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (3,600)  
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Service Cost $ 411 $ 404
Cost of Goods, Total [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component   (3,000)
Operating Expense [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component   $ (1,300)