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Supplemental Cash Flow Information (Tables)
3 Months Ended
Mar. 31, 2018
Supplemental Cash Flow Information [Abstract]  
Net Cash Paid For Interest and Income Taxes
Net cash paid for interest and income taxes was as follows for the three-month periods ended March 31, 2018 and 2017 (in thousands):
 
Three Months Ended 
 March 31,
 
2018
 
2017
Interest (1)
$
50,103

 
$
77,828

Income Taxes, Net of Refunds Received
$
3,554

 
$
81,960

 
(1)
Net of capitalized interest of $5 million and $7 million for the three months ended March 31, 2018 and 2017, respectively.