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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following: 
 
 
June 30,
 
December 31,
 
 
2017
 
2016
 
 
(In thousands)
Coal
 
$
60,887

 
$
37,268

Repair parts and supplies
 
76,169

 
76,194

 
 
$
137,056

 
$
113,462