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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