Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 959,315	$ 1,132,079	$ 2,947,264	$ 4,312,797
OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	728,467	912,420	2,245,648	3,585,280
Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	363,573	493,515	1,032,866	2,261,250
Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	65,669	82,922	206,404	261,656
Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	299,225	335,983	1,006,378	1,062,374
Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	230,848	219,659	701,616	727,517
Chassis, chassis parts and slide-out mechanisms | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	202,429	295,256	603,221	1,341,567
Windows and doors | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	214,135	244,011	652,840	876,354
Furniture and mattresses | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	104,266	179,710	370,175	651,456
Axles and suspension solutions | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	82,083	67,343	246,466	257,766
Other | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	125,554	126,100	372,946	458,137
U.S.
Disaggregation of Revenue [Line Items]
Net sales	860,030	1,039,450	2,629,737	4,007,330
U.S. | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	647,383	836,344	1,981,703	3,333,811
U.S. | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	352,774	480,207	994,581	2,218,157
U.S. | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	40,254	60,964	124,946	185,118
U.S. | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	254,355	295,173	862,176	930,536
U.S. | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	212,647	203,106	648,034	673,519
International
Disaggregation of Revenue [Line Items]
Net sales	99,285	92,629	317,527	305,467
International | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	81,084	76,076	263,945	251,469
International | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	10,799	13,308	38,285	43,093
International | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	25,415	21,958	81,458	76,538
International | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	44,870	40,810	144,202	131,838
International | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 18,201	$ 16,553	$ 53,582	$ 53,998