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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