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Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Net sales $ (115,788) $ (137,483)
Gross profit (33,157) (42,947)
Operating Segments | Units    
Segment Reporting Information [Line Items]    
Net sales (107,874) (130,720)
Gross profit (33,958) (46,054)
Operating Segments | Parts    
Segment Reporting Information [Line Items]    
Net sales (7,981) (6,880)
Gross profit (2,950) (3,177)
Other    
Segment Reporting Information [Line Items]    
Net sales 67 117
Gross profit 3,751 6,284
Inter-segment    
Segment Reporting Information [Line Items]    
Net sales (5,890) (6,786)
Gross profit $ (31) $ (395)