Segment Reporting (Schedule of Information Relating to Segments) (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
Operating profit (loss)	398,410	222,934	200,210
Total assets	3,288,094	2,298,031	1,862,595
Expenditures for long-lived assets	375,121	299,259	469,188
Depreciation and amortization	112,320	97,980	75,358
Purchase of long-lived assets as part of business acquisition	271,900	230,400	395,600
OEM Segment
Segment Reporting Information
Net sales	3,643,612	2,167,911	2,091,901
Aftermarket Segment
Segment Reporting Information
Net sales	829,085	628,255	279,581
Corporate and Other
Segment Reporting Information
Operating profit (loss)	0	0	0
Total assets	162,360	122,653	99,008
Depreciation and amortization	$ 0	$ 0	$ 0
Customer Concentration Risk | Net sales | Thor Industries, Inc.
Segment Reporting Information
Consolidated risk, percentage	23.00%	21.00%	27.00%
Customer Concentration Risk | Net sales | Berkshire Hathaway Inc.
Segment Reporting Information
Consolidated risk, percentage	20.00%	19.00%	21.00%
Operating Segments
Segment Reporting Information
Net sales	$ 4,472,697	$ 2,796,166	$ 2,371,482
Operating profit (loss)	398,410	222,934	200,210
Total assets	3,125,734	2,175,378	1,763,587
Expenditures for long-lived assets	375,121	299,259	469,188
Depreciation and amortization	112,320	97,980	75,358
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	3,643,612	2,167,911	2,091,901
Operating profit (loss)	304,676	156,092	165,290
Total assets	2,289,746	1,559,953	1,167,899
Expenditures for long-lived assets	208,297	284,109	166,331
Depreciation and amortization	83,723	74,088	66,807
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	829,085	628,255	279,581
Operating profit (loss)	93,734	66,842	34,920
Total assets	835,988	615,425	595,688
Expenditures for long-lived assets	166,824	15,150	302,857
Depreciation and amortization	$ 28,597	$ 23,892	$ 8,551