Goodwill and Acquired Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Acquired Intangible Assets (Finite Lived)

The components of acquired intangible assets as of March 31, 2016 and December 31, 2015 were as follows:

	March 31, 2016							December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			NetCarrying Value		GrossCarrying Amount		Accumulated Amortization			NetCarrying Value
	(in thousands)
Developed technology	$	9,819	$	(7,578	)	$	2,241	$	9,819	$	(6,288	)	$	3,531
Customer and vendor relationships, databases		236,238		(47,886	)		188,352		236,238		(44,192	)		192,046
Trademarks		529		(276	)		253		529		(215	)		314
Other		250		—			250		—		—			—
Total amortizable intangible assets		246,836		(55,740	)		191,096		246,586		(50,695	)		195,891
Indefinite-lived trademarks		89,676		—			89,676		89,676		—			89,676
Total acquired intangible assets	$	336,512	$	(55,740	)	$	280,772	$	336,262	$	(50,695	)	$	285,567

Components of Acquired Intangible Assets (Infinite Lived)

The components of acquired intangible assets as of March 31, 2016 and December 31, 2015 were as follows:

	March 31, 2016							December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			NetCarrying Value		GrossCarrying Amount		Accumulated Amortization			NetCarrying Value
	(in thousands)
Developed technology	$	9,819	$	(7,578	)	$	2,241	$	9,819	$	(6,288	)	$	3,531
Customer and vendor relationships, databases		236,238		(47,886	)		188,352		236,238		(44,192	)		192,046
Trademarks		529		(276	)		253		529		(215	)		314
Other		250		—			250		—		—			—
Total amortizable intangible assets		246,836		(55,740	)		191,096		246,586		(50,695	)		195,891
Indefinite-lived trademarks		89,676		—			89,676		89,676		—			89,676
Total acquired intangible assets	$	336,512	$	(55,740	)	$	280,772	$	336,262	$	(50,695	)	$	285,567

Estimated Future Amortization of Acquired Intangible Assets

Estimated future amortization expense of acquired intangible assets as of March 31, 2016 was as follows:

	(in thousands)
The remainder of 2016	$	13,463
2017		14,632
2018		14,538
2019		13,064
2020		12,661
Thereafter		122,738
Total	$	191,096