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Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 650,492 | $ 498,336
OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 600,179 | 462,029
Travel trailers and fifth-wheels |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 404,957 | 330,274
Motorhomes |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 52,915 | 37,044
Adjacent industries OEMs |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 142,307 | 94,711
Aftermarket Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 50,313 | 36,307
Chassis, chassis parts and slide-out mechanisms | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 252,702 | 222,949
Windows and doors | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 149,520 | 97,200
Furniture and mattresses | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 105,518 | 71,174
Axles and suspension solutions | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 33,605 | 32,181
Other | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 58,834 | 38,525
U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 627,902 | 489,574
U.S. | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 580,556 | 455,611
U.S. | Travel trailers and fifth-wheels |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 403,742 | 329,318
U.S. | Motorhomes |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 43,406 | 33,762
U.S. | Adjacent industries OEMs |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 133,408 | 92,531
U.S. | Aftermarket Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 47,346 | 33,963
International |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 22,590 | 8,762
International | OEM Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 19,623 | 6,418
International | Travel trailers and fifth-wheels |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,215 | 956
International | Motorhomes |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 9,509 | 3,282
International | Adjacent industries OEMs |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 8,899 | 2,180
International | Aftermarket Segment |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 2,967 | $ 2,344

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