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Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash paid during the period for:    
Interest $ 7,060 $ 6,935
Income taxes 8,627 4,943
Change in accounts payable related to property, plant, and equipment $ 11,477 $ 15,404