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Consolidated Financial Statement Details (Tables)
 12 Months Ended
Dec. 31, 2016
Consolidated Financial Statement Details [Abstract]  
Other (expense) income, net
Other (Expense) Income, Net

(In thousands)
 
2016
  
2015
  
2014
 
 
         
Interest income
 
$
1,185
  
$
1,029
  
$
573
 
Environmental expense, non-operating properties
  
(1,279
)
  
(46
)
  
(822
)
Other
  
798
   
1,205
   
6
 
 
            
Other income (expense), net
 
$
704
  
$
2,188
  
$
(243
)