Segment Reporting (Schedule of Information Relating to Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information
Net sales	$ 4,122,017	$ 3,741,208	$ 3,784,808
Cost of sales	3,141,722	2,861,493	3,008,618
Gross profit	980,295	879,715	776,190
Selling, general and administrative expenses	700,373	661,478	652,762
Operating profit (loss)	279,922	218,237	123,428
Total assets	3,175,987	2,894,739
Expenditures for long-lived assets	59,174	48,062	88,980
Depreciation and amortization	121,231	125,693	131,768
Purchase of long-lived assets as part of business acquisition	6,200	6,000	28,300
OEM Segment
Segment Reporting Information
Net sales	3,189,653	2,860,450	2,903,742
Aftermarket Segment
Segment Reporting Information
Net sales	$ 932,364	$ 880,758	$ 881,066
Customer Concentration Risk | Net sales | Thor Industries, Inc.
Segment Reporting Information
Consolidated risk, percentage	15.00%	16.00%	16.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc.
Segment Reporting Information
Consolidated risk, percentage	18.00%	18.00%	15.00%
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	$ 3,189,653	$ 2,860,450	$ 2,903,742
Cost of sales	2,533,371	2,303,283	2,448,176
Gross profit	656,282	557,167	455,566
Selling, general and administrative expenses	472,162	450,086	438,205
Operating profit (loss)	184,120	107,081	17,361
Expenditures for long-lived assets	28,248	28,593	68,750
Depreciation and amortization	86,996	93,327	99,976
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	932,364	880,758	881,066
Cost of sales	608,351	558,210	560,442
Gross profit	324,013	322,548	320,624
Selling, general and administrative expenses	228,211	211,392	214,557
Operating profit (loss)	95,802	111,156	106,067
Expenditures for long-lived assets	30,926	19,469	20,230
Depreciation and amortization	$ 34,235	$ 32,366	$ 31,792