Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net sales	$ 1,403,066	$ 1,190,782	$ 1,015,576	[1]
Cost of sales	1,097,064	935,859	802,467
Gross profit	306,002	254,923	213,109
Selling, general and administrative expenses	186,032	157,482	132,935
Severance	3,716	0	0
Sale of extrusion assets	0	1,954	0
Executive succession	0	0	1,876
Operating profit	116,254	95,487	78,298	[2]
Interest expense, net	1,885	430	351
Income before income taxes	114,369	95,057	77,947
Provision for income taxes	40,024	32,791	27,828
Net income	$ 74,345	$ 62,266	$ 50,119
Net income per common share:
Basic (in usd per share)	$ 3.06	$ 2.60	$ 2.15
Diluted (in usd per share)	$ 3.02	$ 2.56	$ 2.11
Weighted average common shares outstanding:
Basic (in shares)	24,295	23,911	23,321
Diluted (in shares)	24,650	24,334	23,753

[1] (a) Thor Industries, Inc., a customer of the RV Segment, accounted for 29 percent, 33 percent and 34 percent of the Company’s consolidated net sales for the years ended December 31, 2015, 2014 and 2013, respectively. Berkshire Hathaway Inc. (through its subsidiaries Forest River, Inc. and Clayton Homes, Inc.), a customer of both segments, accounted for 26 percent, 28 percent and 28 percent of the Company’s consolidated net sales for the years ended December 31, 2015, 2014 and 2013, respectively. Jayco, Inc., a customer of the RV Segment, accounted for 10 percent of the Company's consolidated net sales for the year ended December 31, 2015. No other customer accounted for more than 10 percent of consolidated net sales in the years ended December 31, 2015, 2014 and 2013.

[2] (b) Certain general and administrative expenses are allocated between the segments based upon net sales or operating profit, depending upon the nature of the expense.