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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 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross at beginning of period |  |  | $ 319,127 | $ 150,030
Accumulated impairment losses at beginning of period |  |  | (1,663) | (1,663)
Goodwill at beginning of period |  |  | 317,464 | 148,367
Acquisition of Supreme |  |  | (1,520) | (169,235)
Effects of foreign currency |  |  | 84 | (138)
Impairment of goodwill | $ (4,900) |  | (4,944) | 0
Goodwill, gross at end of period |  |  | 317,691 | 319,127
Accumulated impairment losses at end of period |  |  | (6,607) | (1,663)
Goodwill at end of period |  |  | 311,084 | 317,464
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 | 0
Effects of foreign currency |  |  | 0 | 0
Impairment of goodwill |  | $ (1,700) | 0 | 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 |  |  | 145,604 | 145,742
Accumulated impairment losses at beginning of period |  |  | 0 | 0
Goodwill at beginning of period |  |  | 145,604 | 145,742
Acquisition of Supreme |  |  | 0 | 0
Effects of foreign currency |  |  | 84 | (138)
Impairment of goodwill | $ (4,900) |  | (4,944) | 0
Goodwill, gross at end of period |  |  | 145,688 | 145,604
Accumulated impairment losses at end of period |  |  | (4,944) | 0
Goodwill at end of period |  |  | 140,744 | 145,604
Final Mile Products |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross at beginning of period |  |  | 169,235 | 0
Accumulated impairment losses at beginning of period |  |  | 0 | 0
Goodwill at beginning of period |  |  | 169,235 | 0
Acquisition of Supreme |  |  | (1,520) | (169,235)
Effects of foreign currency |  |  | 0 | 0
Impairment of goodwill |  |  | 0 | 0
Goodwill, gross at end of period |  |  | 167,715 | 169,235
Accumulated impairment losses at end of period |  |  | 0 | 0
Goodwill at end of period |  |  | $ 167,715 | $ 169,235

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