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Supplemental Disclosure of Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Information [Abstract]  
Supplemental Disclosure of Cash Flow Information
Six Months Ended
June 30, 2018
 
June 30, 2017
 
(in thousands)
Non-cash investing and financing activities —
 
 
 
Property, plant and equipment acquired with accrued liabilities
$
37,168

 
$
31,579

 
 
 
 
Cash (paid) refunded during the period —
 
 
 
Interest (net of amounts capitalized)
$
(67,119
)
 
$
(65,820
)
Income taxes (paid) refunded
$
(14,837
)
 
$
1