GOODWILL AND INTANGIBLE ASSETS (Details3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Intangible assets with definite lives
Gross Carrying Amount	$ 185,639	$ 152,317
Accumulated Amortization	(98,937)	(83,310)
Total	86,702us-gaap_FiniteLivedIntangibleAssetsNet	69,007us-gaap_FiniteLivedIntangibleAssetsNet
Weighted-Average Useful Life (Years)	3 years 4 months 24 days	3 years 2 months 12 days
Future amortization expense of intangible assets with definite-lives
2015	44,262
2016	24,099
2017	13,441
2018	4,547
2019	353
Total	86,702us-gaap_FiniteLivedIntangibleAssetsNet	69,007us-gaap_FiniteLivedIntangibleAssetsNet
Content
Intangible assets with definite lives
Gross Carrying Amount	62,602	47,800
Accumulated Amortization	(36,988)	(22,373)
Total	25,614	25,427
Weighted-Average Useful Life (Years)	4 years 1 month 6 days	4 years
Future amortization expense of intangible assets with definite-lives
Total	25,614	25,427
Technology
Intangible assets with definite lives
Gross Carrying Amount	54,981	41,694
Accumulated Amortization	(20,988)	(25,324)
Total	33,993	16,370
Weighted-Average Useful Life (Years)	3 years 2 months 12 days	2 years 10 months 24 days
Future amortization expense of intangible assets with definite-lives
Total	33,993	16,370
Trade names
Intangible assets with definite lives
Gross Carrying Amount	30,110	29,283
Accumulated Amortization	(21,681)	(16,427)
Total	8,429	12,856
Weighted-Average Useful Life (Years)	2 years 7 months 6 days	3 years
Future amortization expense of intangible assets with definite-lives
Total	8,429	12,856
Customer lists
Intangible assets with definite lives
Gross Carrying Amount	24,566	22,584
Accumulated Amortization	(14,050)	(13,116)
Total	10,516	9,468
Weighted-Average Useful Life (Years)	2 years 7 months 6 days	2 years 6 months
Future amortization expense of intangible assets with definite-lives
Total	10,516	9,468
Advertiser and supplier relationships
Intangible assets with definite lives
Gross Carrying Amount	13,380	10,956
Accumulated Amortization	(5,230)	(6,070)
Total	8,150	4,886
Weighted-Average Useful Life (Years)	4 years	2 years 10 months 24 days
Future amortization expense of intangible assets with definite-lives
Total	$ 8,150	$ 4,886

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References