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Operating Segments (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Summary of Information about Reportable Segments

										Project
		Products				Research				Consulting				Consolidated
Three Months Ended June 30, 2015
Research services revenues		$	52,604			$	—			$	—			$	52,604
Advisory services and events revenues			8,255				11,323				10,629				30,207
Total segment revenues			60,859				11,323				10,629				82,811
Segment expenses			11,532				12,808				6,773				31,113
Contribution margin (loss)			49,327				(1,485	)			3,856				51,698
Selling, marketing, administrative and other expenses															(41,300	)
Amortization of intangible assets															(224	)
Reorganization costs															(81	)
Other income and gains (losses) on investments															(89	)
Income before income taxes														$	10,004

										Project
		Products				Research				Consulting				Consolidated
Three Months Ended June 30, 2014
Research services revenues		$	52,322			$	—			$	—			$	52,322
Advisory services and events revenues			9,994				12,672				7,959				30,625
Total segment revenues			62,316				12,672				7,959				82,947
Segment expenses			11,894				13,399				6,438				31,731
Contribution margin (loss)			50,422				(727	)			1,521				51,216
Selling, marketing, administrative and other expenses															(42,561	)
Amortization of intangible assets															(536	)
Reorganization costs															(1,039	)
Other income and gains (losses) on investments															122
Income before income taxes														$	7,202

										Project
		Products				Research				Consulting				Consolidated
Six Months Ended June 30, 2015
Research services revenues		$	104,462			$	—			$	—			$	104,462
Advisory services and events revenues			10,722				21,650				21,164				53,536
Total segment revenues			115,184				21,650				21,164				157,998
Segment expenses			19,881				25,756				13,733				59,370
Contribution margin (loss)			95,303				(4,106	)			7,431				98,628
Selling, marketing, administrative and other expenses															(85,300	)
Amortization of intangible assets															(445	)
Reorganization costs															(3,505	)
Other income and gains (losses) on investments															174
Income before income taxes														$	9,552

										Project
		Products				Research				Consulting				Consolidated
Six Months Ended June 30, 2014
Research services revenues		$	103,115			$	—			$	—			$	103,115
Advisory services and events revenues			12,851				26,648				13,404				52,903
Total segment revenues			115,966				26,648				13,404				156,018
Segment expenses			20,245				27,374				12,115				59,734
Contribution margin (loss)			95,721				(726	)			1,289				96,284
Selling, marketing, administrative and other expenses															(86,221	)
Amortization of intangible assets															(1,075	)
Reorganization costs															(1,888	)
Other income and gains (losses) on investments															95
Income before income taxes														$	7,195