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INVENTORIES (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
 
March 31, 2017
 
December 31, 2016
 
(In thousands)
Coal stockpiles
$
31,170

 
$
44,692

Coal fuel inventories
5,384

 
6,816

Materials and supplies
87,386

 
77,628

Reserve for obsolete inventory
(3,642
)
 
(3,621
)
Total
$
120,298

 
$
125,515