Segment Reporting (Schedule Of Net Sales By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information
Total net sales	$ 289,351	$ 294,271	$ 321,783	$ 285,377	$ 224,947	$ 250,851	$ 287,192	$ 252,586	$ 1,190,782	$ 1,015,576	$ 901,123	[1]
Travel Trailer And Fifth-Wheels
Segment Reporting Information
Total net sales									844,096	727,783	653,478
Motorhomes
Segment Reporting Information
Total net sales									67,774	47,937	34,612
RV Aftermarket
Segment Reporting Information
Total net sales									49,570	25,334	19,119
RV Adjacent Industries [Member]
Segment Reporting Information
Total net sales									113,008	92,640	73,716
RV Segment
Segment Reporting Information
Total net sales									1,074,448	893,694	780,925	[1]
Manufactured Housing OEMs
Segment Reporting Information
Total net sales									77,421	80,245	80,392
Manufactured Housing Aftermarket
Segment Reporting Information
Total net sales									14,186	13,719	13,110
Manufactured Housing Adjacent Industries [Member]
Segment Reporting Information
Total net sales									24,727	27,918	26,696
MH Segment
Segment Reporting Information
Total net sales									$ 116,334	$ 121,882	$ 120,198	[1]

[1] (a) Thor Industries, Inc., a customer of the RV Segment, accounted for 33 percent, 34 percent and 37 percent of the Company’s consolidated net sales for the years ended December 31, 2014, 2013 and 2012, respectively. Berkshire Hathaway Inc. (through its subsidiaries Forest River, Inc. and Clayton Homes, Inc.), a customer of both segments, accounted for 28 percent, 28 percent and 27 percent of the Company’s consolidated net sales for the years ended December 31, 2014, 2013 and 2012, respectively. No other customer accounted for more than 10 percent of consolidated net sales in the years ended December 31, 2014, 2013 and 2012.