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Supplemental Disclosure of Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 2019
Supplemental Cash Flow Information [Abstract]  
Supplemental Disclosure of Cash Flow Information
Three Months Ended
March 31, 2019
 
March 31, 2018
 
(in thousands)
Non-cash investing and financing activities —
 
 
 
Property, plant and equipment acquired with accrued liabilities
$
56,571

 
$
21,708

 
 
 
 
Cash (paid) refunded during the period —
 
 
 
Interest (net of amounts capitalized)
$
(30,672
)
 
$
(36,928
)
Income taxes
$
8

 
$
(14,336
)