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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following: 
 
 
September 30,
 
December 31,
 
 
2016
 
2015
 
 
(In thousands)
Coal
 
$
51,426

 
$
85,043

Repair parts and supplies
 
107,984

 
111,677

 
 
$
159,410

 
$
196,720