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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2018, 2017 and 2016 (in thousands):
 
2018
 
2017
 
2016
 
 
 
 
 
 
Interest, Net of Capitalized Interest
$
243,279

 
$
275,305

 
$
252,030

Income Taxes, Net of Refunds Received
$
75,634

 
$
188,946

 
$
(39,293
)