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Inventories
3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories are summarized as follows:

 
MARCH 31
2016
 
DECEMBER 31
2015
 
MARCH 31
2015
Coal - NACoal
$
16,305

 
$
16,652

 
$
26,306

Mining supplies - NACoal
20,810

 
21,755

 
19,445

Total inventories at weighted average cost
37,115

 
38,407

 
45,751

Sourced inventories - HBB
94,482

 
97,511

 
104,258

Retail inventories - KC
32,737

 
29,098

 
37,087

Total inventories at FIFO
127,219

 
126,609

 
141,345

 
$
164,334

 
$
165,016

 
$
187,096