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Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ (134,772)	$ (113,500)	$ (397,851)	$ (346,759)
Gross profit	(40,848)	(27,410)	(121,926)	(83,044)
Operating Segments | Units
Segment Reporting Information [Line Items]
Net sales	(123,827)	(102,499)	(372,267)	(319,820)
Gross profit	(41,675)	(27,729)	(128,523)	(84,888)
Operating Segments | Parts
Segment Reporting Information [Line Items]
Net sales	(11,222)	(11,028)	(26,162)	(27,287)
Gross profit	(4,917)	(5,077)	(11,641)	(13,236)
Other
Segment Reporting Information [Line Items]
Net sales	277	27	578	348
Gross profit	5,744	5,396	18,238	15,080
Inter-segment
Segment Reporting Information [Line Items]
Net sales	(5,659)	(6,448)	(18,074)	(21,665)
Gross profit	$ 758	$ (44)	$ 1,587	$ (889)

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