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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in the Carrying Amounts of Goodwill (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Mar. 31, 2020 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross at beginning of period |  | $ 312,689,000 |  | $ 312,689,000 | $ 317,691,000
Accumulated impairment losses at beginning of period |  | (1,663,000) |  | (1,663,000) | (6,607,000)
Goodwill at beginning of period |  | 311,026,000 |  | 311,026,000 | 311,084,000
Impact of divestiture on goodwill |  |  |  | 4,685,000 | 4,944,000
Impact of divestiture on accumulated impairment losses |  |  |  |  | 4,944,000
Goodwill impairments | $ 0 |  | $ 4,900,000 | 106,737,000 |
Effects of foreign currency |  |  |  | (44,000) | (58,000)
Goodwill, gross at end of period |  |  |  | 307,960,000 | 312,689,000
Accumulated impairment losses at end of period |  |  |  | (108,400,000) | (1,663,000)
Goodwill at end of period |  |  |  | 199,560,000 | 311,026,000
Commercial Trailer Products |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross at beginning of period |  | 4,288,000 |  | 4,288,000 | 4,288,000
Accumulated impairment losses at beginning of period |  | (1,663,000) |  | (1,663,000) | (1,663,000)
Goodwill at beginning of period |  | 2,625,000 |  | 2,625,000 | 2,625,000
Impact of divestiture on goodwill |  |  |  | 0 | 0
Impact of divestiture on accumulated impairment losses |  |  |  |  | 0
Goodwill impairments |  |  |  | 0 |
Effects of foreign currency |  |  |  | 0 | 0
Goodwill, gross at end of period |  |  |  | 4,288,000 | 4,288,000
Accumulated impairment losses at end of period |  |  |  | (1,663,000) | (1,663,000)
Goodwill at end of period |  |  |  | 2,625,000 | 2,625,000
Diversified Products |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross at beginning of period |  | 140,686,000 |  | 140,686,000 | 145,688,000
Accumulated impairment losses at beginning of period |  | 0 |  | 0 | (4,944,000)
Goodwill at beginning of period |  | 140,686,000 |  | 140,686,000 | 140,744,000
Impact of divestiture on goodwill |  |  |  | 4,685,000 | 4,944,000
Impact of divestiture on accumulated impairment losses |  |  |  |  | 4,944,000
Goodwill impairments |  |  | $ 4,900,000 | 10,971,000 |
Effects of foreign currency |  |  |  | (44,000) | (58,000)
Goodwill, gross at end of period |  |  |  | 135,957,000 | 140,686,000
Accumulated impairment losses at end of period |  |  |  | (10,971,000) | 0
Goodwill at end of period |  |  |  | 124,986,000 | 140,686,000
Final Mile Products |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross at beginning of period |  | 167,715,000 |  | 167,715,000 | 167,715,000
Accumulated impairment losses at beginning of period |  | 0 |  | 0 | 0
Goodwill at beginning of period |  | 167,715,000 |  | 167,715,000 | 167,715,000
Impact of divestiture on goodwill |  |  |  | 0 | 0
Impact of divestiture on accumulated impairment losses |  |  |  |  | 0
Goodwill impairments |  | $ 95,800,000 |  | 95,766,000 |
Effects of foreign currency |  |  |  | 0 | 0
Goodwill, gross at end of period |  |  |  | 167,715,000 | 167,715,000
Accumulated impairment losses at end of period |  |  |  | (95,766,000) | 0
Goodwill at end of period |  |  |  | $ 71,949,000 | $ 167,715,000

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