Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Value of Goodwill

The change in the carrying value of goodwill is as follows:

(In thousands)
Balance as of December 31, 2018	$	641,191
Translation adjustments	(501)
Impairment charge	(224,272)
Balance as of December 31, 2019	$	416,418
Translation adjustments	1,909
Balance as of December 31, 2020	$	418,327
Goodwill	642,599
Accumulated impairment	(224,272)
Total	$	418,327

Carrying Values of Amortizable Acquired Intangible Assets

The carrying values of the Company's amortizable acquired intangible assets are as follows:

	As of						As of
	December 31, 2020						December 31, 2019
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Accumulated Impairment		Net Carrying Amount
Acquired methodologies and technology	$	148,403	$	(106,771)	$	41,632	148,386		$	(86,771)	$	—	$	61,615
Customer relationships	40,168		(31,170)		8,998		40,143		(25,864)		—		14,279
Intellectual property	14,379		(12,787)		1,592		14,372		(12,346)		—		2,026
Acquired software	9,287		(9,286)		1		9,287		(7,928)		—		1,359
Panel	3,139		(3,139)		—		3,123		(3,123)		—		—
Trade names	773		(757)		16		768		(691)		—		77
Strategic alliance	—		—		—		30,100		(12,792)		(17,308)		—
Other	600		(499)		101		600		(397)		—		203
Total intangible assets	$	216,749	$	(164,409)	$	52,340	$	246,779	$	(149,912)	$	(17,308)	$	79,559

Weighted Average Remaining Amortization Period

The weighted-average remaining amortization period by major asset class as of December 31, 2020 is as follows:

	(In years)
Intellectual property	3.7
Customer relationships	1.5
Acquired methodologies and technology	1.4
Trade names	0.2
Acquired software	0.1
Other	0.3

Estimated Future Amortization of Acquired Intangible Assets

The estimated future amortization of intangible assets is as follows:

	(In thousands)
2021	$	25,038
2022	24,567
2023	2,445
2024	290
Total	$	52,340