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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 (in thousands):
 
2017
 
2016
 
2015
 
 
 
 
 
 
Interest, Net of Capitalized Interest
$
275,305

 
$
252,030

 
$
222,088

Income Taxes, Net of Refunds Received
$
188,946

 
$
(39,293
)
 
$
41,108