Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

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

The following tables present information about the Company’s reportable segments (in thousands):

Three Months Ended September 30, 2012:	Research		Consulting		Events		Consolidated
Revenues	$	284,048	$	71,731	$	18,627	$	374,406
Gross contribution		193,540		24,380		4,511		222,431
Corporate and other expenses								(172,663	)
Operating income							$	49,768

Three Months Ended September 30, 2011:	Research		Consulting		Events		Consolidated
Revenues	$	255,979	$	70,815	$	18,990	$	345,784
Gross contribution		173,615		24,458		5,553		203,626
Corporate and other expenses								(156,376	)
Operating income							$	47,250

Nine Months Ended September 30, 2012:	Research		Consulting		Events		Consolidated
Revenues	$	836,970	$	222,970	$	81,119	$	1,141,059
Gross contribution		571,547		79,886		32,867		684,300
Corporate and other expenses								(518,254	)
Operating income							$	166,046

Nine Months Ended September 30, 2011:	Research		Consulting		Events		Consolidated
Revenues	$	749,429	$	219,407	$	72,058	$	1,040,894
Gross contribution		506,420		78,820		28,533		613,773
Corporate and other expenses								(469,174	)
Operating income							$	144,599