Segment Reporting (Schedule of Information Relating to Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information
Net sales	$ 3,741,208	$ 3,784,808	$ 5,207,143
Cost of sales	2,861,493	3,008,618	3,933,854
Gross profit	879,715	776,190	1,273,289
Selling, general and administrative expenses	661,478	652,762	720,261
Operating profit (loss)	218,237	123,428	553,028
Total assets	2,894,739	2,959,319
Expenditures for long-lived assets	48,062	88,980	206,977
Depreciation and amortization	125,693	131,768	129,212
Purchase of long-lived assets as part of business acquisition	6,000	28,300	78,700
OEM Segment
Segment Reporting Information
Net sales	2,860,450	2,903,742	4,315,870
Aftermarket Segment
Segment Reporting Information
Net sales	$ 880,758	$ 881,066	$ 891,273
Customer Concentration Risk | Net sales | Thor Industries, Inc.
Segment Reporting Information
Consolidated risk, percentage	16.00%	16.00%	23.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc.
Segment Reporting Information
Consolidated risk, percentage	18.00%	15.00%	20.00%
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	$ 2,860,450	$ 2,903,742	$ 4,315,870
Cost of sales	2,303,283	2,448,176	3,325,354
Gross profit	557,167	455,566	990,516
Selling, general and administrative expenses	450,086	438,205	511,366
Operating profit (loss)	107,081	17,361	479,150
Expenditures for long-lived assets	28,593	68,750	173,732
Depreciation and amortization	93,327	99,976	99,419
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	880,758	881,066	891,273
Cost of sales	558,210	560,442	608,500
Gross profit	322,548	320,624	282,773
Selling, general and administrative expenses	211,392	214,557	208,895
Operating profit (loss)	111,156	106,067	73,878
Expenditures for long-lived assets	19,469	20,230	33,245
Depreciation and amortization	$ 32,366	$ 31,792	$ 29,793