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SEGMENTS Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Net sales
Net sales	$ 533,174	$ 491,319
Income (loss) from operations	25,198	25,656
Assets	1,408,632	1,409,548	$ 1,304,393
Commercial Trailer Products
Net sales
Net sales	340,145	327,397
Diversified Products
Net sales
Net sales	92,180	88,463
Final Mile Products
Net sales
Net sales	100,849	75,459
Corporate and Eliminations
Net sales
Net sales	(8,368)	(6,765)
Income (loss) from operations	(11,036)	(9,462)
Assets	213,522	234,515
Corporate and Eliminations | Commercial Trailer Products
Net sales
Net sales	(900)	(25)
Corporate and Eliminations | Diversified Products
Net sales
Net sales	(7,468)	(6,740)
Corporate and Eliminations | Final Mile Products
Net sales
Net sales	0	0
Operating Segments | Commercial Trailer Products
Net sales
Net sales	341,045	327,422
Income (loss) from operations	26,321	29,481
Assets	359,999	350,187
Operating Segments | Diversified Products
Net sales
Net sales	99,648	95,203
Income (loss) from operations	8,044	5,028
Assets	345,577	356,852
Operating Segments | Final Mile Products
Net sales
Net sales	100,849	75,459
Income (loss) from operations	1,869	609
Assets	$ 489,534	$ 467,994

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