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GOODWILL IMPAIRMENT - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Goodwill, gross | $ 312,820 | $ 312,689 | $ 317,691
Goodwill impairment loss | 106,737 |  |
Goodwill, end of period | 204,420 | 311,026 | 311,084
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, gross | 4,288 | 4,288 | 4,288
Goodwill impairment loss | 0 |  |
Goodwill, end of period | 2,625 | 2,625 | 2,625
Diversified Products |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross | 140,817 | 140,686 | 145,688
Goodwill impairment loss | 10,971 |  |
Goodwill, end of period | 129,846 | 140,686 | 140,744
Final Mile Products |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross | 167,715 | 167,715 | 167,715
Goodwill impairment loss | 95,766 |  |
Goodwill, end of period | $ 71,949 | $ 167,715 | $ 167,715

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