Quarterly Results Of Operations (Tables)

12 Months Ended

Mar. 31, 2012

Quarterly Results Of Operations [Abstract]

Schedule Of Quarterly Results Of Operations

	Three Months Ended
	(in thousands, except per share data)
	March 31,		Dec. 31,		Sept. 30,		June 30,		March 31,		Dec. 31,		Sept. 30,		June 30,
	2012		2011		2011		2011		2011		2010		2010		2010
Revenue	$	89,462	$	83,297	$	72,624	$	63,296	$	77,980	$	76,336	$	69,413	$	66,811
Gross profit	$	70,502	$	66,058	$	57,047	$	49,400	$	61,593	$	60,244	$	55,106	$	52,236
Net income	$	12,947	$	10,031	$	7,051	$	2,399	$	10,771	$	11,101	$	8,248	$	7,145
Diluted net income per share	$	0.30	$	0.24	$	0.17	$	0.06	$	0.25	$	0.26	$	0.19	$	0.17