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GOODWILL - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | $ 296,838 | $ 307,952 | $ 307,960 | $ 312,689
Accumulated impairment losses, beginning of period | (108,400) | (108,400) | (108,400) | (1,663)
Goodwill, net, beginning of period | 188,438 | 199,552 | 199,560 | 311,026
Goodwill impairments |  |  |  | (106,737)
Impact of divestiture on goodwill |  | (11,101) |  | (4,685)
Effects of foreign currency | 5 | (13) | (8) | (44)
Goodwill, end of period | 296,843 | 296,838 | 307,952 | 307,960
Accumulated impairment losses | (108,400) | (108,400) | (108,400) | (108,400)
Goodwill, net, end of period | 188,443 | 188,438 | 199,552 | 199,560
Transportation Solutions |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | 188,762 | 188,770 | 188,775 | 193,488
Accumulated impairment losses, beginning of period | (68,257) | (68,257) | (68,257) | 0
Goodwill, net, beginning of period | 120,505 | 120,513 | 120,518 | 193,488
Goodwill impairments |  |  |  | (68,257)
Impact of divestiture on goodwill |  | 0 |  | (4,685)
Effects of foreign currency | 3 | (8) | (5) | (28)
Goodwill, end of period | 188,765 | 188,762 | 188,770 | 188,775
Accumulated impairment losses | (68,257) | (68,257) | (68,257) | (68,257)
Goodwill, net, end of period | 120,508 | 120,505 | 120,513 | 120,518
Parts & Service |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | 108,076 | 119,182 | 119,185 | 119,201
Accumulated impairment losses, beginning of period | (40,143) | (40,143) | (40,143) | (1,663)
Goodwill, net, beginning of period | 67,933 | 79,039 | 79,042 | 117,538
Goodwill impairments |  |  |  | (38,480)
Impact of divestiture on goodwill |  | (11,101) |  | 0
Effects of foreign currency | 2 | (5) | (3) | (16)
Goodwill, end of period | 108,078 | 108,076 | 119,182 | 119,185
Accumulated impairment losses | (40,143) | (40,143) | (40,143) | (40,143)
Goodwill, net, end of period | $ 67,935 | $ 67,933 | $ 79,039 | $ 79,042

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