Segment Reporting (Schedule Of Information Relating To Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information
Net sales	$ 547,483	$ 440,831	$ 1,045,819	$ 863,629
Operating profit	63,040	59,388	122,169	115,116
Travel Trailer And Fifth-Wheels
Segment Reporting Information
Net sales	357,251	289,686	687,525	573,055
Motorhomes
Segment Reporting Information
Net sales	36,248	27,866	73,292	56,389
Adjacent Industries OEMs
Segment Reporting Information
Net sales	109,276	89,364	203,987	170,125
Operating Segments | OEM Segment
Segment Reporting Information
Net sales	502,775	406,916	964,804	799,569
Operating profit	56,445	54,402	110,842	105,053
Operating Segments | Aftermarket Segment
Segment Reporting Information
Net sales	44,708	33,915	81,015	64,060
Operating profit	$ 6,595	$ 4,986	$ 11,327	$ 10,063