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Supplemental Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 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 six-month periods ended June 30, 2018 and 2017 (in thousands):
 
Six Months Ended 
 June 30,
 
2018
 
2017
Interest (1)
$
133,148

 
$
136,733

Income Taxes, Net of Refunds Received
$
62,777

 
$
98,157

 
(1)
Net of capitalized interest of $11 million and $14 million for the six months ended June 30, 2018 and 2017, respectively.