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Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following tables present operating information about the Company’s reportable segments for the years ended December 31 (in thousands):

		Research				Consulting				Events				Consolidated
2012
Revenues		$	1,137,147			$	304,893			$	173,768			$	1,615,808
Gross contribution			774,342				109,253				80,119				963,714
Corporate and other expenses															(718,007	)
Operating income														$	245,707

			Research				Consulting				Events				Consolidated
2011
Revenues		$	1,012,062			$	308,047			$	148,479			$	1,468,588
Gross contribution			682,136				114,838				66,265				863,239
Corporate and other expenses															(649,177	)
Operating income														$	214,062

			Research				Consulting				Events				Consolidated
2010
Revenues		$	865,000			$	302,117			$	121,337			$	1,288,454
Gross contribution			564,527				121,885				55,884				742,296
Corporate and other expenses															(593,031	)
Operating income														$	149,265

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

Summarized information by geographic location as of and for the years ended December 31 follows (in thousands):

		2012				2011				2010
Revenues:
United States and Canada		$	947,075			$	861,481			$	765,793
Europe, Middle East and Africa			458,675				437,194				380,771
Other International			210,058				169,913				141,890
Total revenues		$	1,615,808			$	1,468,588			$	1,288,454

Long-lived assets: (1)
United States and Canada (2)		$	114,557			$	85,194			$	69,163
Europe, Middle East and Africa			30,967				23,673				21,856
Other International			16,956				10,754				6,175
Total long-lived assets		$	162,480			$	119,621			$	97,194

Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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