Net Income Per Share (Schedule Of Basic And Diluted Net Income Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Net Income Per Share [Abstract]
Net income	$ 4,562		$ 3,603		$ 8,685	$ 6,589
Weighted-average shares of common stock outstanding (in shares)	30,428		29,242		30,360	28,899
Shares used in computing basic net income per share (in shares)	30,428		29,242		30,360	28,899
Stock options (in shares)	150		202		157	206
Restricted stock subject to vesting (in shares)	592		604		564	598
Contingently issuable shares (in shares)	0	[1]	112	[1]	0	109
Shares issuable for acquisition consideration (in shares)	598		655		553	618
Shares used in computing diluted net income per share (in shares)	31,768		30,815		31,634	30,430
Basic net income per share (in dollars per share)	$ 0.15		$ 0.12		$ 0.29	$ 0.23
Diluted net income per share (in dollars per share)	$ 0.14		$ 0.12		$ 0.27	$ 0.22
Anti-dilutive options and restricted stock not included in the calculation of diluted net income per share (in shares)	0		0		1	14

[1] For the three months ended March 31, 2013, represents the shares held in escrow pursuant to the Agreement and Plan of Merger with Northridge Systems, Inc. (“Northridge”) and pursuant to the Asset Purchase Agreement with Nascent Systems, LP (“Nascent”)as part of the consideration, and for the three months ended March 31, 2012, represents the shares held in escrow pursuant to the Asset Purchase Agreement with PointBridge Solutions, LLC (“PointBridge”) as part of the consideration. These shares were not included in the calculation of basic net income per share due to the uncertainty of their ultimate status.