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Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ (137,483)	$ (113,822)
Gross profit	(42,947)	(25,430)
Operating Segments | Units
Segment Reporting Information [Line Items]
Net sales	(130,720)	(107,068)
Gross profit	(46,054)	(26,385)
Operating Segments | Parts
Segment Reporting Information [Line Items]
Net sales	(6,880)	(6,911)
Gross profit	(3,177)	(3,669)
Other
Segment Reporting Information [Line Items]
Net sales	117	157
Gross profit	6,284	4,624
Inter-segment
Segment Reporting Information [Line Items]
Net sales	(6,786)	(7,922)
Gross profit	$ 395	$ (677)

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