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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of inventories, net of reserves

		2017				2016
Chassis		$	7,525			$	8,524
Raw materials			30,109				26,322
Work in process			13,521				11,620
Finished goods			17,412				17,670
		$	68,567			$	64,136

Schedule of property, plant and equipment

		2017				2016
Land and improvements		$	11,333			$	10,027
Buildings and improvements			66,826				57,697
Machinery and equipment			44,161				34,984
Furniture and fixtures			10,227				9,243
Software costs			10,345				10,281
			142,892				122,232
Less accumulated depreciation			(65,264	)			(62,619	)
		$	77,628			$	59,613

Schedule of accrued liabilities

		2017				2016
Accrued wages, commissions, bonuses and benefits		$	8,632			$	7,452
Accrued products warranty			3,147				2,821
Accrued taxes			828				2,887
Other			9,394				7,567
		$	22,001			$	20,727

Schedule of product warranty liability

		2017				2016
Accrual at beginning of the year		$	2,821			$	3,140
Provision			2,618				1,750
Settlement and Other			(2,292	)			(2,069	)
Accrual at end of year		$	3,147			$	2,821

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.

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