Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,421,660		$ 1,486,451		$ 1,468,108		$ 1,282,922		$ 1,362,325		$ 1,389,292		$ 1,381,417		$ 1,280,247		$ 5,659,141		$ 5,413,281		$ 5,374,800
Gross margin	266,696		277,663		263,965		235,832		256,628		256,246		258,675		246,813		1,044,156		1,018,362		995,259
Net income attributable to the Company	$ 22,593		$ 28,633		$ 21,891		$ 7,946		$ 7,136		$ 20,012		$ 42,788		$ 16,355		$ 81,063		$ 86,291		$ 81,425
Net income attributable to the Company per share of common stock (A)	$ 1.42	[1]	$ 1.80	[1]	$ 1.37	[1]	$ 0.50	[1]	$ 0.45	[2]	$ 1.26	[2]	$ 2.67	[2]	$ 1.02	[2]	$ 5.09	[3]	$ 5.40	[3]	$ 5.14	[3]
Common stock dividend declared, percent																	2.50%		20.00%		10.00%
Average common shares outstanding by quarter			15,507,191		15,577,599		15,634,284		12,946,278		12,973,095		13,021,478		13,012,497		15,935,751		15,969,060		15,837,597

[1] All periods adjusted for a two and a half percent (2.5%) stock dividend declared in December 2013. Prior to these adjustments, the average common shares outstanding for the first, second and third quarters of 2013 were 15,634,284, 15,577,599, and 15,507,191, respectively.

[2] All periods adjusted for a two and a half percent (2.5%) stock dividend declared in December 2013 and a twenty percent (20%) stock dividend declared in December 2012. Prior to these adjustments, the average common shares outstanding for the first, second, third, and fourth quarters of 2012 were 13,012,497, 13,021,478, 12,973,095, and 12,946,278, respectively.

[3] Adjusted for the declaration of a two and a half percent (2.5%) stock dividend in December 2013, shares related to which were issued in February 2014. Prior to the adjustment, the average common shares outstanding were 15,580 and 15,451 for the years ended December 31, 2012 and 2011, respectively.