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

 
$
2,275

 
4
Accumulated amortization
(2,173
)
 
(2,262
)
 
 
Capitalized product development cost, net
—

 
13

 
 
 
 
 
 
 
 
Building photography
9,035

 
18,739

 
2
Accumulated amortization
(8,809
)
 
(18,212
)
 
 
Building photography, net
226

 
527

 
 
 
 
 
 
 
 
Acquired technology
103,128

 
83,469

 
4
Accumulated amortization
(85,344
)
 
(79,188
)
 
 
Acquired technology, net
17,784

 
4,281

 
 
 
 
 
 
 
 
Acquired customer base
339,574

 
225,879

 
10
Accumulated amortization
(199,405
)
 
(169,157
)
 
 
Acquired customer base, net
140,169

 
56,722

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets
190,717

 
167,718

 
12
Accumulated amortization
(59,985
)
 
(46,369
)
 
 
Acquired trade names and other intangible assets, net
130,732

 
121,349

 
 
 
 
 
 
 
 
Intangible assets, net
$
288,911

 
$
182,892