Quarterly Financial Data

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data - Unaudited [Abstract]

Quarterly Financial Information [Text Block]

Quarterly Financial Data - Unaudited

The following tables present the unaudited financial data for each of the interim periods in 2011 and 2010. Subsequent to the issuance of the unaudited consolidated financial statements for the quarter ended September 30, 2011, the Company discovered an under estimation of the rebate reserves that amounted to an increase to the reserves and a reduction to net sales for the year ended December 31, 2010. The previously presented unaudited consolidated quarterly financial statements for the interim periods in 2010 have been adjusted retrospectively. The Company's management believes the effects of these adjustments are not material to any of its previously issued consolidated financial statements.

	Quarter Ended
	March 31		June 30		Sept. 30		Dec. 31
2011
Total revenue	$	71,471	$	77,796	$	76,458	$	76,470
Gross profit	34,626		36,201		35,574		35,953
Net income	8,073		9,493		9,261		17,842
Net income per share:
Basic	$	0.59	$	0.69	$	0.66	$	1.29
Diluted	$	0.57	$	0.67	$	0.65	$	1.26
2010 (restated)
Total revenue	$	63,723	$	68,625	$	75,482	$	75,129
Gross profit	26,287		31,890		33,777		37,016
Net income	3,859		7,566		8,817		9,681
Net income per share:
Basic	$	0.28	$	0.56	$	0.65	$	0.71
Diluted	$	0.27	$	0.55	$	0.64	$	0.70