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SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales
Net sales	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 543,444	$ 425,098	$ 435,903	$ 362,716	$ 2,319,136	$ 2,267,278	$ 1,767,161
Depreciation and amortization													42,357	40,683	35,053
Income (Loss) from operations													142,786	110,987	130,816
Assets	1,304,591				1,304,393				1,351,513				1,304,591	1,304,393	1,351,513
Commercial Trailer Products
Net sales
Net sales													1,519,592	1,536,687	1,348,251
Diversified Products
Net sales
Net sales													357,634	372,342	348,449
Final Mile Products
Net sales
Net sales													441,910	358,249	70,461
Operating Segments | Commercial Trailer Products
Net sales
Net sales													1,521,541	1,536,939	1,348,382
Depreciation and amortization													10,667	9,631	9,975
Income (Loss) from operations													145,877	141,795	151,999
Assets	362,328				355,183				311,705				362,328	355,183	311,705
Operating Segments | Diversified Products
Net sales
Net sales													384,516	393,971	361,358
Depreciation and amortization													18,621	21,177	22,236
Income (Loss) from operations													29,748	(3,033)	20,376
Assets	317,246				349,423				340,651				317,246	349,423	340,651
Operating Segments | Final Mile Products
Net sales
Net sales													441,910	358,249	70,461
Depreciation and amortization													11,361	8,314	1,152
Income (Loss) from operations													9,804	7,907	(2,098)
Assets	511,862				484,634				404,246				511,862	484,634	404,246
Corporate and Eliminations
Net sales
Net sales													(28,831)	(21,881)	(13,040)
Depreciation and amortization													1,708	1,561	1,690
Income (Loss) from operations													(42,643)	(35,682)	(39,461)
Assets	$ 113,155				$ 115,153				$ 294,911				113,155	115,153	294,911
Corporate and Eliminations | Commercial Trailer Products
Net sales
Net sales													1,949	252	131
Corporate and Eliminations | Diversified Products
Net sales
Net sales													26,882	21,629	12,909
Corporate and Eliminations | Final Mile Products
Net sales
Net sales													$ 0	$ 0	$ 0

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