Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data [Abstract]

Schedule Of Selected Quarterly Financial Data

	Quarter ended
	December 31, 2011		September 30, 2011		June 30, 2011			March 31, 2011
(in thousands)
Consolidated revenue	$	69,861	$	57,538	$	55,128		$	47,896
Gross profit		32,865		27,763		25,203			23,197
Total operating expenses		22,166		18,972		17,202			15,786
Income from operations		10,699		8,791		8,001			7,411
Income tax (benefit) expense		703		917		(5,479	)		885
Net income		8,005		7,220		13,373			6,822
Basic net income per share	$	0.16	$	0.14	$	0.27		$	0.14
Diluted net income per share	$	0.16	$	0.14	$	0.26		$	0.14

	Quarter ended
	December 31, 2010			September 30, 2010		June 30, 2010		March 31, 2010
(in thousands)
Consolidated revenue	$	51,595		$	41,503	$	35,144	$	31,627
Gross profit		24,871			18,828		15,956		14,321
Total operating expenses		15,182			13,668		12,542		11,663
Income from operations		9,689			5,160		3,414		2,658
Income tax (benefit) expense		(594	)		284		247		236
Net income		9,443			5,368		2,737		2,018
Basic net income per share	$	0.20		$	0.12	$	0.06	$	0.04
Diluted net income per share	$	0.20		$	0.11	$	0.06	$	0.04