Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Intangible Assets and Goodwill [Table Text Block]

The following table presents changes to the carrying amount of goodwill by reporting unit during the nine months ended September 30, 2012 (in thousands):

	Research		Consulting		Events		Total
Balance, December 31, 2011	$	366,980	$	99,677	$	41,893	$	508,550
Addition due to acquisition (1)		7,455		—		—		7,455
Foreign currency translation adjustments		2,488		683		24		3,195
Balance, September 30, 2012 (2)	$	376,923	$	100,360	$	41,917	$	519,200

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following tables present reconciliations of the carrying amounts of amortizable intangible assets as of the dates indicated (in thousands):

September 30, 2012	Trade Name			Customer Relationships			Content			Software			Total
Gross cost, December 31, 2011	$	5,758		$	7,210		$	—		$	—		$	12,968
Additions due to acquisition (1)		240			3,170			3,170			1,955			8,535
Foreign currency translation adjustments		18			207			234			134			593
Gross cost		6,016			10,587			3,404			2,089			22,096
Accumulated amortization (2)		(3,210	)		(5,238	)		(284	)		(222	)		(8,954	)
Balance, September 30, 2012	$	2,806		$	5,349		$	3,120		$	1,867		$	13,142

December 31, 2011	Trade Name			Customer Relationships			Content		Software		Total
Gross cost, December 31, 2010	$	5,758		$	7,210			—	—	$	12,968
Foreign currency translation adjustments		—			—			—	—		—
Gross cost		5,758			7,210			—	—		12,968
Accumulated amortization (2)		(2,303	)		(3,605	)		—	—		(5,908	)
Balance, December 31, 2011	$	3,455		$	3,605			—	—	$	7,060

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The estimated future amortization expense by year from amortizable intangibles is as follows (in thousands):

2012 (remaining three months)	$	1,370
2013		5,475
2014		3,600
2015		1,995
2016		702
	$	13,142