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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories are summarized as follows:

 
MARCH 31
2015
 
DECEMBER 31
2014
 
MARCH 31
2014
Coal - NACoal
$
26,306

 
$
29,576

 
$
29,521

Mining supplies - NACoal
19,445

 
19,774

 
17,920

Total inventories at weighted average cost
45,751

 
49,350

 
47,441

Sourced inventories - HBB
104,258

 
104,746

 
97,322

Retail inventories - KC
37,087

 
36,286

 
49,150

Total inventories at FIFO
141,345

 
141,032

 
146,472

 
$
187,096

 
$
190,382

 
$
193,913