Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 1,132,079	$ 1,165,309	$ 4,312,797	$ 3,259,287
OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	912,420	946,281	3,585,280	2,627,185
Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	493,515	602,429	2,261,250	1,633,059
Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	82,922	63,259	261,656	193,105
Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	335,983	280,593	1,062,374	801,021
Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	219,659	219,028	727,517	632,102
Chassis, chassis parts and slide-out mechanisms | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	295,256	351,837	1,341,567	948,135
Windows and doors | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	244,011	254,526	876,354	761,168
Furniture and mattresses | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	179,710	184,741	651,456	508,789
Axles and suspension solutions | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	67,343	68,120	257,766	184,092
Other | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	126,100	87,057	458,137	225,001
U.S.
Disaggregation of Revenue [Line Items]
Net sales	1,039,450	1,077,657	4,007,330	2,977,786
U.S. | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	836,344	873,091	3,333,811	2,391,813
U.S. | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	480,207	586,830	2,218,157	1,582,182
U.S. | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	60,964	39,679	185,118	118,872
U.S. | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	295,173	246,582	930,536	690,759
U.S. | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	203,106	204,566	673,519	585,973
International
Disaggregation of Revenue [Line Items]
Net sales	92,629	87,652	305,467	281,501
International | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	76,076	73,190	251,469	235,372
International | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	13,308	15,599	43,093	50,877
International | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	21,958	23,580	76,538	74,233
International | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	40,810	34,011	131,838	110,262
International | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 16,553	$ 14,462	$ 53,998	$ 46,129