Segment Reporting (Schedule Of Information Relating To Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information
Net sales	$ 554,814	$ 412,370	$ 1,600,633	$ 1,275,999
Operating profit	47,927	45,138	170,096	160,254
Travel Trailer And Fifth-Wheels
Segment Reporting Information
Net sales	357,940	263,579	1,045,465	836,634
Motorhomes
Segment Reporting Information
Net sales	41,595	29,373	114,887	85,762
Adjacent Industries OEMs
Segment Reporting Information
Net sales	106,386	82,963	310,373	253,088
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	505,921	375,915	1,470,725	1,175,484
Operating profit	41,025	39,049	151,867	144,102
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	48,893	36,455	129,908	100,515
Operating profit	$ 6,902	$ 6,089	$ 18,229	$ 16,152