XML 48 R36.htm IDEA: XBRL DOCUMENT v3.19.2
INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory components consist of the following:
 
June 30,
2019
 
December 31,
2018
Coal
$
3,878

 
$
4,642

Supplies
47,313

 
44,004

Total Inventories
$
51,191

 
$
48,646