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Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ (113,500) | $ (112,937) | $ (346,759) | $ (321,607)
Gross profit | (27,385) | (32,763) | (83,353) | (75,738)
Operating Segments | Units |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (102,499) | (104,957) | (319,820) | (300,623)
Gross profit | (27,713) | (33,488) | (84,998) | (79,407)
Operating Segments | Parts |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (11,028) | (8,321) | (27,287) | (21,700)
Gross profit | (5,074) | (3,893) | (13,245) | (9,880)
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 27 | 341 | 348 | 716
Gross profit | 5,402 | 4,618 | 14,890 | 13,549
Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (6,448) | (7,669) | (21,665) | (21,306)
Gross profit | $ (44) | $ 39 | $ (889) | $ (325)

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