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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in the Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Goodwill, gross at beginning of period |  | $ 317,691 | $ 319,127
Accumulated impairment losses at beginning of period |  | (6,607) | (1,663)
Goodwill at beginning of period |  | 311,084 | 317,464
Acquisition of Supreme |  |  | (1,520)
Effects of foreign currency |  | (58) | 84
Impairment of goodwill | $ (4,900) |  | (4,944)
Impact of divestiture on goodwill |  | (4,944) |
Impact of divestiture on accumulated impairment losses |  | 4,944 |
Goodwill, gross at end of period |  | 312,689 | 317,691
Accumulated impairment losses at end of period |  | (1,663) | (6,607)
Goodwill at end of period |  | 311,026 | 311,084
Commercial Trailer Products |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross at beginning of period |  | 4,288 | 4,288
Accumulated impairment losses at beginning of period |  | (1,663) | (1,663)
Goodwill at beginning of period |  | 2,625 | 2,625
Acquisition of Supreme |  |  | 0
Effects of foreign currency |  | 0 | 0
Impairment of goodwill |  |  | 0
Impact of divestiture on goodwill |  | 0 |
Impact of divestiture on accumulated impairment losses |  | 0 |
Goodwill, gross at end of period |  | 4,288 | 4,288
Accumulated impairment losses at end of period |  | (1,663) | (1,663)
Goodwill at end of period |  | 2,625 | 2,625
Diversified Products |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross at beginning of period |  | 145,688 | 145,604
Accumulated impairment losses at beginning of period |  | (4,944) | 0
Goodwill at beginning of period |  | 140,744 | 145,604
Acquisition of Supreme |  |  | 0
Effects of foreign currency |  | (58) | 84
Impairment of goodwill | $ (4,900) |  | (4,944)
Impact of divestiture on goodwill |  | (4,944) |
Impact of divestiture on accumulated impairment losses |  | 4,944 |
Goodwill, gross at end of period |  | 140,686 | 145,688
Accumulated impairment losses at end of period |  | 0 | (4,944)
Goodwill at end of period |  | 140,686 | 140,744
Final Mile Products |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross at beginning of period |  | 167,715 | 169,235
Accumulated impairment losses at beginning of period |  | 0 | 0
Goodwill at beginning of period |  | 167,715 | 169,235
Acquisition of Supreme |  |  | (1,520)
Effects of foreign currency |  | 0 | 0
Impairment of goodwill |  |  | 0
Impact of divestiture on goodwill |  | 0 |
Impact of divestiture on accumulated impairment losses |  | 0 |
Goodwill, gross at end of period |  | 167,715 | 167,715
Accumulated impairment losses at end of period |  | 0 | 0
Goodwill at end of period |  | $ 167,715 | $ 167,715

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