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Interim Statement Presentation Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Supplemental Disclosures of Cash Flow Information
 
 
 
Six Months Ended
(In thousands)
 
 
2018
 
2017
Cash paid during the period for:
 
 
 
 
 
Interest (including amounts capitalized of $5,874 and $5,520, respectively)
 
 
$
8,333

 
$
9,067

Income taxes, net of refunds
 
 
(86,825
)
 
99,104