GOODWILL AND INTANGIBLE ASSETS (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Balance	$ 145,893	$ 139,453
Accumulated Amortization	(100,223)	(90,952)
Net Carrying Amount	45,670	48,501
Customer affiliate and advertiser relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	96,970	95,810
Accumulated Amortization	(67,730)	(60,799)
Net Carrying Amount	29,240	35,011
Trademarks trade names and domain names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	8,213	11,873
Accumulated Amortization	(7,933)	(10,555)
Net Carrying Amount	280	1,318
Developed technologies and websites [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	39,870	31,770
Accumulated Amortization	(24,385)	(19,598)
Net Carrying Amount	15,485	12,172
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Balance	840
Accumulated Amortization	(175)
Net Carrying Amount	$ 665