Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 1,362,325		$ 1,389,292		$ 1,381,417		$ 1,280,247		$ 1,358,691		$ 1,457,971		$ 1,370,970		$ 1,187,168		$ 5,413,281		$ 5,374,800		$ 4,616,377
Gross Margin	256,628		256,246		258,675		246,813		252,324		268,244		248,741		225,950		1,018,362		995,259		866,641
Net income attributable to the Company	$ 7,136		$ 20,012		$ 42,788		$ 16,355		$ 13,430		$ 32,546		$ 23,921		$ 11,528		$ 86,291		$ 81,425		$ 41,998
Net income attributable to the Company per share of common stock (A)	$ 0.46	[1]	$ 1.29	[1]	$ 2.74	[1]	$ 1.05	[1]	$ 0.87	[2]	$ 2.11	[2]	$ 1.55	[2]	$ 0.74	[2]	$ 5.54	[3]	$ 5.27	[3]	$ 2.73	[3]
Common stock dividend declared, percent																	20.00%		10.00%		10.00%
Average common shares outstanding by quarter			12,973,095		13,021,478		13,012,497		12,857,950		11,704,135		11,714,133		11,723,618		15,579,571		15,451,314		15,373,756

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

[2] All periods adjusted for twenty percent (20%) stock dividend declared in December 2012 and a ten percent (10%) stock dividend declared in December 2011. Prior to these adjustments, the average common shares outstanding for the first, second, third, and fourth quarters of 2011 were 11,723,618, 11,714,133, 11,704,135, and 12,857,950, respectively.

[3] Adjusted for the declaration of a twenty percent (20%) stock dividend in December 2012, shares related to which were issued in February 2013. Prior to the adjustment, the average common shares outstanding were 12,876 and 12,812 for the years ended December 31, 2011 and 2010, respectively.