XML 37 R14.htm IDEA: XBRL DOCUMENT v3.6.0.2
Inventories
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
INVENTORIES:
 
December 31,
 
2016
 
2015
Coal
$
7,800

 
$
4,660

Supplies
57,661

 
62,132

Total Inventories
$
65,461

 
$
66,792