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INVENTORIES (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
 
September 30, 2016
 
December 31, 2015
 
(In thousands)
Coal stockpiles
$
42,439

 
$
38,636

Coal fuel inventories
7,103

 
7,194

Materials and supplies
81,998

 
78,784

Reserve for obsolete inventory
(2,855
)
 
(2,756
)
Total
$
128,685

 
$
121,858