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Benefit Plans Benefit Plans 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Amounts recognized in the consolidated balance sheets:    
Post-employment benefits $ 11,985 $ 16,715
Pension Plan [Member]    
Amounts recognized in the consolidated balance sheets:    
Other current liabilities 3,298 2,814
Post-employment benefits 10,534 15,067
Net amount recognized 13,832 17,881
Amounts recognized in accumulated other comprehensive loss:    
Net actuarial (loss) gain (4,781) (5,798)
Prior service cost 0 (35)
Total amounts recognized in accumulated other comprehensive loss (4,781) (5,833)
Postretirement Health Coverage [Member]    
Amounts recognized in the consolidated balance sheets:    
Other current liabilities 220 220
Post-employment benefits 1,271 1,464
Net amount recognized 1,491 1,684
Amounts recognized in accumulated other comprehensive loss:    
Net actuarial (loss) gain 1,121 1,167
Prior service cost 554 922
Total amounts recognized in accumulated other comprehensive loss $ 1,675 $ 2,089