Summary of Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Summary of quarterly results of operations

	2012
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Full Year
Net sales	$	2,136,344	$	2,573,022	$	2,603,226	$	2,221,870	$	9,534,462
Gross profit	909,839		1,150,597		1,150,282		995,508		4,206,226
Net income	100,216		227,813		234,953		68,052		631,034
Net income per common share - basic	.97		2.23		2.29		0.66		6.15
Net income per common share - diluted	.95		2.17		2.24		0.65		6.02

	2011
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Full Year
Net sales	$	1,855,586	$	2,354,751	$	2,484,920	$	2,070,442	$	8,765,699
Gross profit	797,408		1,022,755		1,038,299		886,100		3,744,562
Net income	68,316		179,115		179,877		14,552		441,860
Net income per common share - basic	.64		1.69		1.74		.14		4.22
Net income per common share - diluted	.63		1.66		1.71		.14		4.14