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Supplemental Disclosures to Consolidated Statements of Cash Flows (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Supplemental disclosures to consolidated statements of cash flows
(In thousands)
 
2017
 
2016
 
2015
Cash paid during the year for:
 
 
 
 
 
 
Income taxes
 
$
3,999

 
$
4,651

 
$
14,346

Interest, net of amounts capitalized
 
10,372

 
6,462

 
3,754

Non-cash investing and financing activities:
 
 
 
 
 
 
Change in construction related payables
 
(5,951
)
 
(15,830
)
 
13,040

Capital lease obligations incurred for real estate and equipment purchases
 
140

 
4,133

 
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