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Supplemental Cash Flow Disclosures (Tables)
 3 Months Ended
Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Disclosures
 
Three Months Ended September 30,
(in thousands)
2018
 
2017
Cash paid during the period for:
 
 
 
Interest
$
9,966

 
$
7,060

Income taxes
9,911

 
8,627

Supplemental disclosure of non-cash information:
 
 
 
Changes in accounts payable related to purchases of property, plant and equipment
(3,200
)
 
8,300