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Inventories
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories

12. Inventories

Inventories are stated at the lower of cost or market, with cost determined using the first-in-first out method. The Company writes down the inventory for estimated obsolescence and to lower of cost or market value based upon assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected by the Company, additional inventory write-downs may be required. Once established, the original cost of the inventory less the related inventory allowance represents the new cost basis of such inventories. The AEC segment has long-term contracts under which we incur engineering and development costs that are allocable to parts that will be delivered over multiple years. These costs are included in Work in process in the table below.

As of June 30, 2016 and December 31, 2015, inventories consisted of the following:

(in thousands)  

June 30,

2016

  December 31, 2015
Raw materials  $36,612   $27,636 
Work in process  68,142   41,823 
Finished goods  40,617   36,947 
Total inventories  $145,371   $106,406