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INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 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):
 
September 30,
2016
 
December 31,
2015
 
Weighted-
Average
Amortization
Period (in years)
Capitalized product development cost
$
2,275

 
$
2,243

 
4
Accumulated amortization
(2,205
)
 
(2,172
)
 
 
Capitalized product development cost, net
70

 
71

 
 
 
 
 
 
 
 
Building photography
17,375

 
17,677

 
4
Accumulated amortization
(16,246
)
 
(15,875
)
 
 
Building photography, net
1,129

 
1,802

 
 
 
 
 
 
 
 
Acquired database technology
78,332

 
77,905

 
5
Accumulated amortization
(69,870
)
 
(62,818
)
 
 
Acquired database technology, net
8,462

 
15,087

 
 
 
 
 
 
 
 
Acquired customer base
221,385

 
221,409

 
10
Accumulated amortization
(145,859
)
 
(129,782
)
 
 
Acquired customer base, net
75,526

 
91,627

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets
153,736

 
153,910

 
13
Accumulated amortization
(31,810
)
 
(24,179
)
 
 
Acquired trade names and other intangible assets, net
121,926

 
129,731

 
 
 
 
 
 
 
 
Intangible assets, net
$
207,113

 
$
238,318