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SEGMENTS - Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales
Net sales	$ 479,277	$ 482,566	$ 449,422	$ 392,003	$ 404,078	$ 351,584	$ 339,153	$ 387,074	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 1,803,268	$ 1,481,889	$ 2,319,136
Depreciation and amortization													48,842	47,970	42,357
Income (Loss) from operations													33,542	(85,608)	142,786
Transportation Solutions
Net sales
Net sales													1,628,694	1,308,935	2,103,955
Parts & Services
Net sales
Net sales													174,574	172,954	215,181
Operating Segments | Transportation Solutions
Net sales
Net sales													1,633,319	1,315,429	2,114,809
Depreciation and amortization													41,819	40,236	34,821
Income (Loss) from operations													61,869	(29,702)	153,907
Operating Segments | Parts & Services
Net sales
Net sales													177,166	179,474	226,019
Depreciation and amortization													4,781	5,512	5,828
Income (Loss) from operations													20,201	(12,658)	31,523
Corporate and Eliminations
Net sales
Net sales													(7,217)	(13,014)	(21,692)
Depreciation and amortization													2,242	2,222	1,708
Income (Loss) from operations													(48,528)	(43,248)	(42,644)
Corporate and Eliminations | Transportation Solutions
Net sales
Net sales													4,625	6,494	10,854
Corporate and Eliminations | Parts & Services
Net sales
Net sales													$ 2,592	$ 6,520	$ 10,838

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