Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	First				Second				Third				Fourth
	2012		2011		2012		2011		2012		2011		2012		2011
Net Sales	$	290,707	$	250,946	$	280,256	$	243,002	$	268,248	$	269,468	$	260,349	$	260,347
Gross Profit	100,826		90,317		92,757		85,625		90,116		95,285		89,119		90,354
Operating Income	65,501		60,091		57,512		53,247		57,623		62,247		53,819		55,783
Net Income	46,345		42,333		40,767		38,472		41,877		43,397		39,599		40,466
Earnings Per Share*	$	0.32	$	0.29	$	0.28	$	0.27	$	0.29	$	0.30	$	0.28	$	0.28

*Diluted