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INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2018
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):
 
June 30,
2018
 
December 31,
2017
 
Weighted-
Average
Amortization
Period (in years)
Capitalized product development cost
$
2,173

 
$
2,275

 
4
Accumulated amortization
(2,167
)
 
(2,262
)
 
 
Capitalized product development cost, net
6

 
13

 
 
 
 
 
 
 
 
Building photography
9,116

 
18,739

 
2
Accumulated amortization
(8,653
)
 
(18,212
)
 
 
Building photography, net
463

 
527

 
 
 
 
 
 
 
 
Acquired database technology
93,390

 
83,469

 
4
Accumulated amortization
(81,941
)
 
(79,188
)
 
 
Acquired database technology, net
11,449

 
4,281

 
 
 
 
 
 
 
 
Acquired customer base
335,594

 
225,879

 
10
Accumulated amortization
(183,513
)
 
(169,157
)
 
 
Acquired customer base, net
152,081

 
56,722

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets
188,632

 
167,718

 
13
Accumulated amortization
(53,020
)
 
(46,369
)
 
 
Acquired trade names and other intangible assets, net
135,612

 
121,349

 
 
 
 
 
 
 
 
Intangible assets, net
$
299,611

 
$
182,892