Segment Reporting (Schedule of Information Relating to Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Net sales	$ 5,207,143	$ 4,472,697	$ 2,796,166
Operating profit (loss)	553,028	398,410	222,934
Total assets	3,246,912	3,288,094
Expenditures for long-lived assets	206,977	375,121	299,259
Depreciation and amortization	129,212	112,320	97,980
Purchase of long-lived assets as part of business acquisition	78,700	271,900	230,400
OEM Segment
Segment Reporting Information
Net sales	4,315,870	3,643,612	2,167,911
Aftermarket Segment
Segment Reporting Information
Net sales	$ 891,273	$ 829,085	$ 628,255
Customer Concentration Risk | Net sales | Thor Industries, Inc.
Segment Reporting Information
Consolidated risk, percentage	23.00%	24.00%	22.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc.
Segment Reporting Information
Consolidated risk, percentage	20.00%	20.00%	19.00%
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	$ 4,315,870	$ 3,643,612	$ 2,167,911
Operating profit (loss)	479,150	304,676	156,092
Expenditures for long-lived assets	173,732	208,297	284,109
Depreciation and amortization	99,419	83,723	74,088
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	891,273	829,085	628,255
Operating profit (loss)	73,878	93,734	66,842
Expenditures for long-lived assets	33,245	166,824	15,150
Depreciation and amortization	$ 29,793	$ 28,597	$ 23,892