Segment Reporting (Schedule Of Information Relating To Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information
Net sales	$ 440,831	$ 362,085	$ 863,629	$ 723,542
Operating profit	59,388	33,634	115,116	65,472
OEM Segment
Segment Reporting Information
Net sales	406,916	336,300	799,569	676,719
Operating profit	54,402	29,917	105,053	59,203
Travel Trailer And Fifth-Wheels
Segment Reporting Information
Net sales	289,686	245,707	573,055	506,064
Motorhomes
Segment Reporting Information
Net sales	27,866	18,899	56,389	40,546
Adjacent Industries
Segment Reporting Information
Net sales	89,364	71,694	170,125	130,109
Aftermarket Segment
Segment Reporting Information
Net sales	33,915	25,785	64,060	46,823
Operating profit	$ 4,986	$ 3,717	$ 10,063	$ 6,269