Segment Reporting (Schedule of Information Relating to Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Net sales	$ 3,784,808	$ 5,207,143	$ 4,472,697
Operating profit (loss)	123,428	553,028	398,410
Total assets	2,959,319	3,246,912
Expenditures for long-lived assets	88,980	206,977	375,121
Depreciation and amortization	131,768	129,212	112,320
Purchase of long-lived assets as part of business acquisition	28,300	78,700	271,900
OEM Segment
Segment Reporting Information
Net sales	2,903,742	4,315,870	3,643,612
Aftermarket Segment
Segment Reporting Information
Net sales	$ 881,066	$ 891,273	$ 829,085
Customer Concentration Risk | Net sales | Thor Industries, Inc.
Segment Reporting Information
Consolidated risk, percentage	16.00%	23.00%	24.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc.
Segment Reporting Information
Consolidated risk, percentage	15.00%	20.00%	20.00%
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	$ 2,903,742	$ 4,315,870	$ 3,643,612
Operating profit (loss)	17,361	479,150	304,676
Expenditures for long-lived assets	68,750	173,732	208,297
Depreciation and amortization	99,976	99,419	83,723
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	881,066	891,273	829,085
Operating profit (loss)	106,067	73,878	93,734
Expenditures for long-lived assets	20,230	33,245	166,824
Depreciation and amortization	$ 31,792	$ 29,793	$ 28,597