Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following is the unaudited quarterly financial information for 2012, 2011 and 2010:

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	(in thousands, except share data)
Year Ended December 31, 2012
Total revenues	$	43,827	$	47,716	$	53,804	$	54,023
Gross Profit	34,798		38,559		44,304		43,576
Operating income	18,329		17,711		20,708		20,260
Net income	15,685		18,067		18,072		18,745
Net income per common share:
Basic	$	0.43	$	0.49	$	0.49	$	0.50
Diluted	$	0.40	$	0.47	$	0.46	$	0.48
Year Ended December 31, 2011
Total revenues	$	40,050	$	42,267	$	42,602	$	44,050
Gross Profit	32,743		33,353		33,895		35,389
Operating income	15,634		18,605		17,954		16,556
Net income	15,164		22,348		16,536		17,330
Net income per common share:
Basic	$	0.40	$	0.57	$	0.44	$	0.48
Diluted	$	0.37	$	0.53	$	0.41	$	0.44
Year Ended December 31, 2010
Total revenues	$	31,603	$	32,207	$	33,281	$	35,097
Gross Profit	24,540		24,780		25,863		27,406
Operating income	12,759		13,008		13,082		13,658
Net income	12,384		14,010		16,681		15,944
Net income per common share:
Basic	$	0.36	$	0.40	$	0.48	$	0.45
Diluted	$	0.32	$	0.36	$	0.43	$	0.42