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Inventory (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Components of Inventory
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