Segment Reporting (Schedule Of Net Sales By Product) (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]
RV Segment - Chassis, Chassis Parts And Slide-Out Mechanisms [Member]
Segment Reporting Information
Total net sales									564,543	493,244	443,850
RV Segment - Windows, Doors And Screens [Member]
Segment Reporting Information
Total net sales									204,054	181,934	173,436
RV Segment - Furniture And Mattresses [Member]
Segment Reporting Information
Total net sales									133,371	100,196	78,082
RV Segment - Axles And Suspension Solutions [Member]
Segment Reporting Information
Total net sales									92,261	69,818	57,275
RV Segment - Other [Member]
Segment Reporting Information
Total net sales									80,219	48,502	28,282
RV Segment
Segment Reporting Information
Total net sales									1,074,448	893,694	780,925	[1]
MH Segment - Windows, Door And Screens [Member]
Segment Reporting Information
Total net sales									66,140	67,029	63,655
MH Segment - Chassis And Chassis Parts [Member]
Segment Reporting Information
Total net sales									33,842	38,359	41,874
MH Segment - Other [Member]
Segment Reporting Information
Total net sales									16,352	16,494	14,669
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.