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INVENTORIES - Summary of inventories, net of reserves (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Chassis	$ 4,650	$ 4,700
Raw materials	29,925	24,291
Work in process	10,658	10,477
Finished goods	19,249	16,992
Inventories	$ 64,482	$ 56,460

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of goods held by the company that are readily available for sale.

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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