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ACQUISITIONS ACQUISITIONS (Details - Schedule of Assets Acquired and Liabilities Assumed for Apartment Finder) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 01, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 1,252,945   $ 1,138,805 $ 718,587
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