Segment Reporting (Schedule Of Information Relating To Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information
Net sales	$ 412,370	$ 345,296	$ 1,275,999	$ 1,068,838
Operating profit	45,138	27,171	160,254	92,643
OEM Segment
Segment Reporting Information
Net sales	375,914	315,213	1,175,483	991,932
Operating profit	39,023	22,468	144,076	81,671
Travel Trailer And Fifth-Wheels
Segment Reporting Information
Net sales	263,579	216,093	836,634	722,157
Motorhomes
Segment Reporting Information
Net sales	29,372	23,539	85,761	64,085
Adjacent Industries
Segment Reporting Information
Net sales	82,963	75,581	253,088	205,690
Aftermarket Segment
Segment Reporting Information
Net sales	36,456	30,083	100,516	76,906
Operating profit	$ 6,115	$ 4,703	$ 16,178	$ 10,972