GOODWILL AND INTANGIBLE ASSETS (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Balance	$ 145,527	$ 139,453
Accumulated Amortization	(105,941)	(90,952)
Net Carrying Amount	39,586	48,501
Customer affiliate and advertiser relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	96,970	95,810
Accumulated Amortization	(71,221)	(60,799)
Net Carrying Amount	25,749	35,011
Trademarks trade names and domain names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	7,847	11,873
Accumulated Amortization	(7,578)	(10,555)
Net Carrying Amount	269	1,318
Developed technologies and websites [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	39,870	31,770
Accumulated Amortization	(26,862)	(19,598)
Net Carrying Amount	13,008	12,172
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	840
Accumulated Amortization	(280)
Net Carrying Amount	$ 560