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Segment Reporting (Schedule of Net Sales by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 536,616 | $ 604,244 | $ 684,455 | $ 650,492 | $ 547,137 | $ 554,814 | $ 547,483 | $ 498,336 | $ 2,475,807 | $ 2,147,770 | $ 1,678,898
OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,242,616 | 1,976,623 | 1,548,091
Travel Trailer and Fifth Wheels |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,440,730 | 1,405,983 | 1,099,882
Motorhomes |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 187,297 | 159,417 | 116,191
OEMs Adjacent Industries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 614,589 | 411,223 | 332,018
Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 233,191 | 171,147 | 130,807
U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,371,750 | 2,101,530 | 1,656,629
U.S. | OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,149,162 | 1,940,893 | 1,531,896
U.S. | Travel Trailer and Fifth Wheels |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,431,574 | 1,403,079 | 1,097,385
U.S. | Motorhomes |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 143,488 | 138,895 | 108,961
U.S. | OEMs Adjacent Industries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 574,100 | 398,919 | 325,550
U.S. | Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 222,588 | 160,637 | 124,733
Int'l |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 104,057 | 46,240 | 22,269
Int'l | OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 93,454 | 35,730 | 16,195
Int'l | Travel Trailer and Fifth Wheels |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,156 | 2,904 | 2,497
Int'l | Motorhomes |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 43,809 | 20,522 | 7,230
Int'l | OEMs Adjacent Industries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 40,489 | 12,304 | 6,468
Int'l | Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 10,603 | $ 10,510 | $ 6,074

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