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SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 610,196 | $ 553,073 | $ 612,690 | $ 491,319 | $ 543,444 | $ 425,098 | $ 435,903 | $ 362,716 | $ 462,057 | $ 464,272 | $ 471,439 | $ 447,676 | $ 2,267,278 | $ 1,767,161 | $ 1,845,444
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 40,682 | 35,053 | 36,769
Income (Loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 110,987 | 130,816 | 202,532
Assets | 1,304,393 |  |  |  | 1,351,513 |  |  |  | 898,733 |  |  |  | 1,304,393 | 1,351,513 | 898,733
Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,536,687 | 1,348,251 | 1,506,070
Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 372,342 | 348,449 | 339,374
Final Mile Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 358,249 | 70,461 | 0
Operating Segments | Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,536,939 | 1,348,382 | 1,506,110
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 9,631 | 9,975 | 12,345
Income (Loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 141,795 | 151,999 | 212,351
Assets | 355,183 |  |  |  | 311,705 |  |  |  | 312,848 |  |  |  | 355,183 | 311,705 | 312,848
Operating Segments | Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 393,971 | 361,358 | 352,404
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 21,177 | 22,236 | 22,970
Income (Loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (3,033) | 20,376 | 24,595
Assets | 349,423 |  |  |  | 340,651 |  |  |  | 370,338 |  |  |  | 349,423 | 340,651 | 370,338
Operating Segments | Final Mile Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 358,249 | 70,461 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 8,314 | 1,152 | 0
Income (Loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | 7,907 | (2,098) | 0
Assets | 484,634 |  |  |  | 404,246 |  |  |  | 0 |  |  |  | 484,634 | 404,246 | 0
Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (21,881) | (13,040) | (13,070)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 1,560 | 1,690 | 1,454
Income (Loss) from operations |  |  |  |  |  |  |  |  |  |  |  |  | (35,682) | (39,461) | (34,414)
Assets | $ 115,153 |  |  |  | $ 294,911 |  |  |  | $ 215,547 |  |  |  | 115,153 | 294,911 | 215,547
Corporate and Eliminations | Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (252) | (131) | (40)
Corporate and Eliminations | Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (21,629) | (12,909) | (13,030)
Corporate and Eliminations | Final Mile Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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