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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Payables and Accruals [Abstract]    
Accrued postretirement benefits $ 893 $ 1,060
Accrued workers’ compensation liabilities 1,885 3,225
Short-term pension liabilities 3,956 347
Business Combination, Contingent Consideration, Liability, Current 100 100
Other (including net taxes payable) 2,868 2,214
Other current liabilities $ 9,702 $ 6,946