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ACQUISITION, SCHEDULE OF ASSETS ACQUIRED AND LIABILITIES ASSUMED FOR APARTMENT FINDER (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Jun. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 1,256,353 $ 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  
Trade Names and Other Intangible Assets [Member] | Apartment Finder [Member]        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill     23,642  
Customer Contracts [Member] | Apartment Finder [Member]        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill     21,856  
Developed Technology Rights [Member] | Apartment Finder [Member]        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill     4,076  
Building Photography [Member] | Apartment Finder [Member]        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill     $ 2,425