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SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales
Net sales	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 543,444	$ 425,098	$ 435,903	$ 362,716	$ 462,057	$ 464,272	$ 471,439	$ 447,676	$ 2,267,278	$ 1,767,161	$ 1,845,444
Depreciation and amortization													40,682	35,053	36,769
Income (Loss) from operations													110,987	130,816	202,532
Assets	1,304,393				1,351,513				898,733				1,304,393	1,351,513	898,733
Commercial Trailer Products
Net sales
Net sales													1,536,687	1,348,251	1,506,070
Diversified Products
Net sales
Net sales													372,342	348,449	339,374
Final Mile Products
Net sales
Net sales													358,249	70,461	0
Operating Segments | Commercial Trailer Products
Net sales
Net sales													1,536,939	1,348,382	1,506,110
Depreciation and amortization													9,631	9,975	12,345
Income (Loss) from operations													141,795	151,999	212,351
Assets	355,183				311,705				312,848				355,183	311,705	312,848
Operating Segments | Diversified Products
Net sales
Net sales													393,971	361,358	352,404
Depreciation and amortization													21,177	22,236	22,970
Income (Loss) from operations													(3,033)	20,376	24,595
Assets	349,423				340,651				370,338				349,423	340,651	370,338
Operating Segments | Final Mile Products
Net sales
Net sales													358,249	70,461	0
Depreciation and amortization													8,314	1,152	0
Income (Loss) from operations													7,907	(2,098)	0
Assets	484,634				404,246				0				484,634	404,246	0
Corporate and Eliminations
Net sales
Net sales													(21,881)	(13,040)	(13,070)
Depreciation and amortization													1,560	1,690	1,454
Income (Loss) from operations													(35,682)	(39,461)	(34,414)
Assets	$ 115,153				$ 294,911				$ 215,547				115,153	294,911	215,547
Corporate and Eliminations | Commercial Trailer Products
Net sales
Net sales													(252)	(131)	(40)
Corporate and Eliminations | Diversified Products
Net sales
Net sales													(21,629)	(12,909)	(13,030)
Corporate and Eliminations | Final Mile Products
Net sales
Net sales													$ 0	$ 0	$ 0

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