Segment Reporting (Schedule of Net Sales by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information
Net sales	$ 4,472,697	$ 2,796,166	$ 2,371,482
OEM Segment
Segment Reporting Information
Net sales	3,643,612	2,167,911	2,091,901
Travel Trailer and Fifth Wheels
Segment Reporting Information
Net sales	2,295,612	1,321,567	1,276,718
Motorhomes
Segment Reporting Information
Net sales	258,995	158,096	155,623
OEMs Adjacent Industries
Segment Reporting Information
Net sales	1,089,005	688,248	659,560
Aftermarket Segment
Segment Reporting Information
Net sales	829,085	628,255	279,581
U.S.
Segment Reporting Information
Net sales	4,098,314	2,559,353	2,225,712
U.S. | OEM Segment
Segment Reporting Information
Net sales	3,329,521	1,952,241	1,962,330
U.S. | Travel Trailer and Fifth Wheels
Segment Reporting Information
Net sales	2,229,839	1,288,209	1,264,404
U.S. | Motorhomes
Segment Reporting Information
Net sales	160,615	100,950	110,405
U.S. | OEMs Adjacent Industries
Segment Reporting Information
Net sales	939,067	563,082	587,521
U.S. | Aftermarket Segment
Segment Reporting Information
Net sales	768,793	607,112	263,382
Int'l
Segment Reporting Information
Net sales	374,383	236,813	145,770
Int'l | OEM Segment
Segment Reporting Information
Net sales	314,091	215,670	129,571
Int'l | Travel Trailer and Fifth Wheels
Segment Reporting Information
Net sales	65,773	33,358	12,314
Int'l | Motorhomes
Segment Reporting Information
Net sales	98,380	57,146	45,218
Int'l | OEMs Adjacent Industries
Segment Reporting Information
Net sales	149,938	125,166	72,039
Int'l | Aftermarket Segment
Segment Reporting Information
Net sales	$ 60,292	$ 21,143	$ 16,199