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Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 604,244 | $ 554,814 | $ 1,939,191 | $ 1,600,633
OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 539,978 | 505,921 | 1,757,075 | 1,470,725
Travel trailers and fifth-wheels |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 338,830 | 357,940 | 1,143,251 | 1,045,465
Motorhomes |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 43,244 | 41,595 | 145,230 | 114,887
Adjacent industries OEMs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 157,904 | 106,386 | 468,594 | 310,373
Aftermarket Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 64,266 | 48,893 | 182,116 | 129,908
Chassis, chassis parts and slide-out mechanisms | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 214,272 | 228,809 | 714,786 | 687,274
Windows and doors | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 157,336 | 111,629 | 476,228 | 318,222
Furniture and mattresses | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 88,411 | 89,672 | 299,207 | 243,586
Axles and suspension solutions | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 30,148 | 30,542 | 96,901 | 95,082
Other | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 49,811 | 45,269 | 169,953 | 126,561
U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 577,523 | 542,354 | 1,863,798 | 1,569,756
U.S. | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 515,787 | 496,010 | 1,690,287 | 1,447,441
U.S. | Travel trailers and fifth-wheels |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 335,842 | 357,290 | 1,137,095 | 1,043,297
U.S. | Motorhomes |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 32,929 | 35,766 | 113,888 | 102,269
U.S. | Adjacent industries OEMs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 147,016 | 102,954 | 439,304 | 301,875
U.S. | Aftermarket Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 61,736 | 46,344 | 173,511 | 122,315
International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 26,721 | 12,460 | 75,393 | 30,877
International | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 24,191 | 9,911 | 66,788 | 23,284
International | Travel trailers and fifth-wheels |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,988 | 650 | 6,156 | 2,168
International | Motorhomes |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 10,315 | 5,829 | 31,342 | 12,618
International | Adjacent industries OEMs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 10,888 | 3,432 | 29,290 | 8,498
International | Aftermarket Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 2,530 | $ 2,549 | $ 8,605 | $ 7,593

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