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Segment Reporting (Schedule of Net Sales by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 547,137 | $ 554,814 | $ 547,483 | $ 498,336 | $ 402,899 | $ 412,370 | $ 440,831 | $ 422,798 | $ 2,147,770 | $ 1,678,898 | $ 1,403,066
OEM Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,976,623 | 1,548,091 | 1,300,060
Travel Trailer and Fifth Wheels |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,405,983 | 1,099,882 | 938,787
Motorhomes |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 159,417 | 116,191 | 86,513
OEMs Adjacent Industries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 411,223 | 332,018 | 274,760
Aftermarket Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 171,147 | $ 130,807 | $ 103,006

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