ACQUISITION ACQUISITION (Details - Schedule of Assets Acquired and Liabilities Assumed for Apartment Finder) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Jun. 01, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 1,254,866	$ 1,252,945		$ 1,138,805
Apartment Finder [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 39
Accounts receivable			4,556
Goodwill			107,692
Deferred income taxes, net			9,290
Other assets and liabilities			(849)
Fair value of identifiable net assets acquired			172,727
Acquired Trade Names and Other Intangible Assets [Member] | Apartment Finder [Member]
Business Acquisition [Line Items]
Intangible assets, other than goodwill			23,642
Acquired Customer Base [Member] | Apartment Finder [Member]
Business Acquisition [Line Items]
Intangible assets, other than goodwill			21,856
Acquired Database Technology [Member] | Apartment Finder [Member]
Business Acquisition [Line Items]
Intangible assets, other than goodwill			4,076
Acquired Building Photography [Member] | Apartment Finder [Member]
Business Acquisition [Line Items]
Intangible assets, other than goodwill			$ 2,425