Business Combinations (Narrative) (Details) (USD $)	Aug. 30, 2011 Nimbus Partners Limited [Member]	Nov. 30, 2011 Loyalty Lab, Inc. [Member]	Dec. 07, 2010 Loyalty Lab, Inc. [Member]	Aug. 31, 2011 OpenSpirit Corporation [Member]	Feb. 28, 2011 OpenSpirit Corporation [Member]	Sep. 22, 2010 OpenSpirit Corporation [Member]	Aug. 31, 2011 Proginet Corporation [Member]	Sep. 15, 2010 Proginet Corporation [Member]	Feb. 28, 2011 Kabira Technologies, Inc. [Member]	Apr. 20, 2010 Kabira Technologies, Inc. [Member]	Mar. 08, 2010 Netrics.Com, Inc. [Member]	Nov. 30, 2010 Foresight Corporation [Member]	Dec. 31, 2009 Foresight Corporation [Member]	Aug. 21, 2009 DataSynapse, Inc. [Member]
Business Acquisition [Line Items]
Total purchase price														$ 28,500,000
Goodwill adjustment related to acquisition		(400,000)		(500,000)	(200,000)		200,000		500,000			(1,100,000)
Acquisition related expenses	1,000,000		400,000			500,000		600,000		500,000	400,000		800,000	800,000
Goodwill acquired deductible for income tax purposes	0		0			0		0		1,300,000	0		0
Cash paid to acquire outstanding shares	$ 42,000,000		$ 23,486,000			$ 18,400,000		$ 22,000,000		$ 3,900,000	$ 10,500,000		$ 30,000,000	$ 27,700,000