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INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2016
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)
 
2015
 
2016
 
Capitalized product development cost
$
2,243

 
$
2,275

 
4
Accumulated amortization
(2,172
)
 
(2,217
)
 
 
Capitalized product development cost, net
71

 
58

 
 
 
 
 
 
 
 
Building photography
17,677

 
17,271

 
4
Accumulated amortization
(15,875
)
 
(16,351
)
 
 
Building photography, net
1,802

 
920

 
 
 
 
 
 
 
 
Acquired database technology
77,905

 
78,151

 
5
Accumulated amortization
(62,818
)
 
(72,691
)
 
 
Acquired database technology, net
15,087

 
5,460

 
 
 
 
 
 
 
 
Acquired customer base
221,409

 
220,749

 
10
Accumulated amortization
(129,782
)
 
(150,445
)
 
 
Acquired customer base, net
91,627

 
70,304

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets
153,910

 
153,607

 
13
Accumulated amortization
(24,179
)
 
(34,384
)
 
 
Acquired trade names and other intangible assets, net
129,731

 
119,223

 
 
 
 
 
 
 
 
Intangible assets, net
$
238,318

 
$
195,965