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Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 684,455 | $ 547,483 | $ 1,334,947 | $ 1,045,819
OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 616,918 | 502,775 | 1,217,097 | 964,804
Travel trailers and fifth-wheels |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 399,464 | 357,251 | 804,421 | 687,525
Motorhomes |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 49,071 | 36,248 | 101,986 | 73,292
Adjacent industries OEMs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 168,383 | 109,276 | 310,690 | 203,987
Aftermarket Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 67,537 | 44,708 | 117,850 | 81,015
Chassis, chassis parts and slide-out mechanisms | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 247,811 | 235,516 | 500,514 | 458,465
Windows and doors | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 169,372 | 109,393 | 318,892 | 206,593
Furniture and mattresses | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 105,278 | 82,740 | 210,796 | 153,914
Axles and suspension solutions | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 33,148 | 32,359 | 66,753 | 64,540
Other | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 61,309 | 42,767 | 120,142 | 81,292
U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 658,373 | 537,828 | 1,286,275 | 1,027,402
U.S. | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 593,944 | 495,818 | 1,174,500 | 951,431
U.S. | Travel trailers and fifth-wheels |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 397,511 | 356,689 | 801,253 | 686,007
U.S. | Motorhomes |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 37,553 | 32,741 | 80,959 | 66,503
U.S. | Adjacent industries OEMs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 158,880 | 106,388 | 292,288 | 198,921
U.S. | Aftermarket Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 64,429 | 42,010 | 111,775 | 75,971
International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 26,082 | 9,655 | 48,672 | 18,417
International | OEM Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 22,974 | 6,957 | 42,597 | 13,373
International | Travel trailers and fifth-wheels |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,953 | 562 | 3,168 | 1,518
International | Motorhomes |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 11,518 | 3,507 | 21,027 | 6,789
International | Adjacent industries OEMs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 9,503 | 2,888 | 18,402 | 5,066
International | Aftermarket Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 3,108 | $ 2,698 | $ 6,075 | $ 5,044

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