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Inventory
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventory
Inventory
Crude oil inventory includes oil in tank and linefill. Equipment and materials consist primarily of proppant, chemicals, tubular goods, well equipment to be used in future drilling or repair operations and well fracturing equipment. Inventory is stated at the lower of cost and net realizable value with cost determined on an average cost method. Inventory consists of the following:
 
March 31, 2017
 
December 31, 2016
 
(In thousands)
Crude oil inventory
$
10,302

 
$
7,086

Equipment and materials
4,025

 
3,562

Total inventory
$
14,327

 
$
10,648