Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 1,536,150	$ 1,093,720	$ 3,180,718	$ 2,093,978
OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	1,276,278	864,654	2,672,860	1,680,904
Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	814,509	527,614	1,767,735	1,030,630
Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	91,480	67,253	178,734	129,846
Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	370,289	269,787	726,391	520,428
Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	259,872	229,066	507,858	413,074
Chassis, chassis parts and slide-out mechanisms | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	486,591	309,237	1,046,311	596,298
Windows and doors | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	301,985	256,722	632,343	506,642
Furniture and mattresses | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	229,520	168,804	471,746	324,048
Axles and suspension solutions | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	93,378	60,850	190,423	115,972
Other | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	164,804	69,041	332,037	137,944
U.S.
Disaggregation of Revenue [Line Items]
Net sales	1,428,284	991,078	2,967,880	1,900,129
U.S. | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	1,188,038	781,081	2,497,467	1,518,722
U.S. | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	800,315	508,810	1,737,950	995,352
U.S. | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	64,008	39,776	124,154	79,193
U.S. | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	323,715	232,495	635,363	444,177
U.S. | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	240,246	209,997	470,413	381,407
International
Disaggregation of Revenue [Line Items]
Net sales	107,866	102,642	212,838	193,849
International | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	88,240	83,573	175,393	162,182
International | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	14,194	18,804	29,785	35,278
International | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	27,472	27,477	54,580	50,653
International | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	46,574	37,292	91,028	76,251
International | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 19,626	$ 19,069	$ 37,445	$ 31,667