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SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales
Net sales	$ 404,078	$ 351,584	$ 339,153	$ 387,074	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 1,481,889	$ 2,319,136	$ 2,267,278
Depreciation and amortization													47,970	42,357	40,683
Income (Loss) from operations													(85,608)	142,786	110,987
Assets	1,161,470				1,304,591				1,304,393				1,161,470	1,304,591	1,304,393
Commercial Trailer Products
Net sales
Net sales													992,528	1,519,592	1,536,687
Diversified Products
Net sales
Net sales													270,963	357,634	372,342
Final Mile Products
Net sales
Net sales													218,398	441,910	358,249
Operating Segments | Commercial Trailer Products
Net sales
Net sales													992,776	1,521,541	1,536,939
Depreciation and amortization													11,557	10,667	9,631
Income (Loss) from operations													79,662	145,877	141,795
Assets	306,587				362,328				355,183				306,587	362,328	355,183
Operating Segments | Diversified Products
Net sales
Net sales													294,134	384,516	393,971
Depreciation and amortization													19,300	18,621	21,177
Income (Loss) from operations													1,563	29,748	(3,033)
Assets	278,643				317,246				349,423				278,643	317,246	349,423
Operating Segments | Final Mile Products
Net sales
Net sales													218,398	441,910	358,249
Depreciation and amortization													14,891	11,361	8,314
Income (Loss) from operations													(123,585)	9,804	7,907
Assets	375,115				511,862				484,634				375,115	511,862	484,634
Corporate and Eliminations
Net sales
Net sales													(23,419)	(28,831)	(21,881)
Depreciation and amortization													2,222	1,708	1,561
Income (Loss) from operations													(43,248)	(42,643)	(35,682)
Assets	$ 201,125				$ 113,155				$ 115,153				201,125	113,155	115,153
Corporate and Eliminations | Commercial Trailer Products
Net sales
Net sales													248	1,949	252
Corporate and Eliminations | Diversified Products
Net sales
Net sales													23,171	26,882	21,629
Corporate and Eliminations | Final Mile Products
Net sales
Net sales													$ 0	$ 0	$ 0

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