Segment Reporting (Schedule Of Information Relating To Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information
Net sales	$ 498,336	$ 422,798
Operating profit	59,129	55,728
OEM Segment
Segment Reporting Information
Net sales	462,029	392,653
Operating profit	54,397	50,651
Travel Trailer And Fifth-Wheels
Segment Reporting Information
Net sales	330,274	283,369
Motorhomes
Segment Reporting Information
Net sales	37,044	28,523
Adjacent Industries
Segment Reporting Information
Net sales	94,711	80,761
Aftermarket Segment
Segment Reporting Information
Net sales	36,307	30,145
Operating profit	$ 4,732	$ 5,077