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Inventory (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories at December 31, 2015 and 2014 are as follows (in thousands):
 
December 31,
2015
 
December 31,
2014
Aggregates
$
7,056

 
$
4,596

Supplies and parts
779

 
1,218

Total inventory
$
7,835

 
$
5,814