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INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of acquired finite-lived intangible assets by major class
Intangible assets consist of the following (in thousands, except amortization period data):
 
 
December 31,
 
Weighted- Average
Amortization Period
(in years)
 
2014
 
2015
 
Capitalized product development cost
$
2,140

 
$
2,243

 
4
Accumulated amortization
(2,140
)
 
(2,172
)
 
 
Capitalized product development cost, net
—

 
71

 
 
 
 
 
 
 
 
Building photography
14,943

 
17,677

 
4
Accumulated amortization
(12,665
)
 
(15,875
)
 
 
Building photography, net
2,278

 
1,802

 
 
 
 
 
 
 
 
Acquired database technology
88,739

 
77,905

 
5
Accumulated amortization
(60,498
)
 
(62,818
)
 
 
Acquired database technology, net
28,241

 
15,087

 
 
 
 
 
 
 
 
Acquired customer base
199,826

 
221,409

 
10
Accumulated amortization
(102,443
)
 
(129,782
)
 
 
Acquired customer base, net
97,383

 
91,627

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets(1)
128,171

 
153,910

 
12
Accumulated amortization
(14,451
)
 
(24,179
)
 
 
Acquired trade names and other intangible assets, net
113,720

 
129,731

 
 
 
 
 
 
 
 
Intangible assets, net
$
241,622

 
$
238,318

 
 

(1) The weighted-average amortization period for acquired trade names excludes $48.7 million for acquired trade names recorded in connection with the LoopNet acquisition on April 30, 2012, which amount is not amortized, but is subject to annual impairment tests.