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SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 596,100 | $ 632,828 | $ 686,620 | $ 620,952 | $ 657,449 | $ 655,150 | $ 642,769 | $ 546,761 | $ 479,277 | $ 482,566 | $ 449,422 | $ 392,003 | $ 2,536,500 | $ 2,502,129 | $ 1,803,268
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 45,320 | 46,969 | 48,842
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 311,949 | 166,642 | 33,542
Transportation Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,320,274 | 2,312,637 | 1,628,694
Parts & Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 216,226 | 189,492 | 174,574
Operating Segments | Transportation Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,338,604 | 2,320,914 | 1,633,319
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 40,443 | 41,187 | 41,819
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 366,928 | 209,942 | 61,869
Operating Segments | Parts & Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 220,873 | 193,476 | 177,166
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 2,201 | 2,717 | 4,781
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 44,649 | 30,558 | 20,201
Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (22,977) | (12,261) | (7,217)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 2,676 | 3,065 | 2,242
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (99,628) | (73,858) | (48,528)
Corporate and Eliminations | Transportation Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 18,330 | 8,277 | 4,625
Corporate and Eliminations | Parts & Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,647 | $ 3,984 | $ 2,592

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