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Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash paid during the period for:    
Interest $ 13,714 $ 13,480
Income taxes 15,866 10,191
Change in accounts payable related to property, plant, and equipment $ 11,477 $ 15,404