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GOODWILL - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | $ 307,960 | $ 312,689
Accumulated impairment losses, beginning of period | (108,400) | (1,663)
Goodwill, net, beginning of period | 199,560 | 311,026
Goodwill impairments |  | (106,737)
Impact of divestiture on goodwill |  | (4,685)
Effects of foreign currency | (8) | (44)
Goodwill, end of period | 307,952 | 307,960
Accumulated impairment losses | (108,400) | (108,400)
Goodwill, net, end of period | 199,552 | 199,560
Commercial Trailer Products |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 4,288 | 4,288
Accumulated impairment losses, beginning of period | (1,663) | (1,663)
Goodwill, net, beginning of period | 2,625 | 2,625
Goodwill impairments |  | 0
Impact of divestiture on goodwill |  | 0
Effects of foreign currency | 0 | 0
Goodwill, end of period | 4,288 | 4,288
Accumulated impairment losses | (1,663) | (1,663)
Goodwill, net, end of period | 2,625 | 2,625
Diversified Products |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 135,957 | 140,686
Accumulated impairment losses, beginning of period | (10,971) | 0
Goodwill, net, beginning of period | 124,986 | 140,686
Goodwill impairments |  | (10,971)
Impact of divestiture on goodwill |  | (4,685)
Effects of foreign currency | (8) | (44)
Goodwill, end of period | 135,949 | 135,957
Accumulated impairment losses | (10,971) | (10,971)
Goodwill, net, end of period | 124,978 | 124,986
Final Mile Products |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 167,715 | 167,715
Accumulated impairment losses, beginning of period | (95,766) | 0
Goodwill, net, beginning of period | 71,949 | 167,715
Goodwill impairments |  | (95,766)
Impact of divestiture on goodwill |  | 0
Effects of foreign currency | 0 | 0
Goodwill, end of period | 167,715 | 167,715
Accumulated impairment losses | (95,766) | (95,766)
Goodwill, net, end of period | $ 71,949 | $ 71,949

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