Other Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Channel Intelligence [Member]	Sep. 30, 2012 Channel Intelligence [Member]	Sep. 30, 2012 Metastorm [Member]	Sep. 30, 2011 Metastorm [Member]	Sep. 30, 2012 Go Industry [Member]	Sep. 30, 2012 Go Industry [Member]	Jun. 30, 2011 Click Equations [Member]	Sep. 30, 2011 Click Equations [Member]
Schedule of Equity Method Investments [Line Items]
Gain on fair value upon consolidation of Channel Intelligence (Note 4)					$ 26,563	$ 26,563
Gain or Loss on sale							208	24,853	2,908	2,900	800	(803)
Other Income (Loss)
Realized gains on sales of marketable securities (Note 5)	106		1,552
Dilution gain on equity method companies (Note 5)		23		496
Gains on sales/distributions of ownership interests	1,704	36	1,716	567
Gain on other distributions				1,424
Other	(55)	(20)	(94)	(33)
Total other income (loss) for parent company	31,226	39	32,853	26,504
Total other income (loss) for consolidated core companies	344	(413)	168	(320)
Other income (loss), net	$ 31,570	$ (374)	$ 33,021	$ 26,184