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GOODWILL - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2019
Goodwill [Line Items]
Goodwill		$ 199,560	$ 188,438	$ 199,552	$ 311,026
Goodwill impairment loss		106,737
Final Mile Product Reporting Unit
Goodwill [Line Items]
Goodwill impairment loss	$ 95,800
Tank Trailers Reporting Unit
Goodwill [Line Items]
Goodwill impairment loss	$ 11,000
Commercial Trailer Products
Goodwill [Line Items]
Goodwill		2,625	2,625	2,625	2,625
Goodwill impairment loss		0
Diversified Products
Goodwill [Line Items]
Goodwill		124,986	113,864	124,978	140,686
Goodwill impairment loss		10,971
Final Mile Products
Goodwill [Line Items]
Goodwill		71,949	$ 71,949	$ 71,949	$ 167,715
Goodwill impairment loss		$ 95,766

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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