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GOODWILL IMPAIRMENT - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 204,351 | $ 204,418 | $ 204,420 | $ 311,026 | $ 311,084
Goodwill impairment loss | 0 | 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 | 2,625
Goodwill impairment loss | 0 | 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 | 129,777 | 129,844 | 129,846 | 140,686 | 140,744
Goodwill impairment loss | 0 | 0 | 10,971 |  |
Final Mile Products |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 71,949 | 71,949 | 71,949 | $ 167,715 | $ 167,715
Goodwill impairment loss | $ 0 | $ 0 | $ 95,766 |  |

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- 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)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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