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GOODWILL IMPAIRMENT - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 204,418	$ 204,420	$ 311,026	$ 311,084
Goodwill impairment loss	0	106,737
Tank Trailers Reporting Unit
Goodwill [Line Items]
Goodwill impairment loss		11,000
Final Mile Product Reporting Unit
Goodwill [Line Items]
Goodwill impairment loss		95,800
Commercial Trailer Products
Goodwill [Line Items]
Goodwill	2,625	2,625	2,625	2,625
Goodwill impairment loss	0	0
Commercial Trailer Products | Tank Trailers Reporting Unit
Goodwill [Line Items]
Goodwill			98,400
Commercial Trailer Products | Process Systems Reporting Unit
Goodwill [Line Items]
Goodwill			42,300
Diversified Products
Goodwill [Line Items]
Goodwill	129,844	129,846	140,686	140,744
Goodwill impairment loss	0	10,971
Final Mile Products
Goodwill [Line Items]
Goodwill	71,949	71,949	$ 167,715	$ 167,715
Goodwill impairment loss	$ 0	$ 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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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.

+ References

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