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INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2019
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):
 
March 31,
2019
 
December 31,
2018
 
Weighted-
Average
Amortization
Period (in years)
Capitalized product development cost
$
2,173

 
$
2,173

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

 
—

 
 
 
 
 
 
 
 
Building photography
9,087

 
9,035

 
2
Accumulated amortization
(8,949
)
 
(8,809
)
 
 
Building photography, net
138

 
226

 
 
 
 
 
 
 
 
Acquired technology
101,887

 
103,128

 
5
Accumulated amortization
(85,963
)
 
(85,344
)
 
 
Acquired technology, net
15,924

 
17,784

 
 
 
 
 
 
 
 
Acquired customer base
339,685

 
339,574

 
10
Accumulated amortization
(207,199
)
 
(199,405
)
 
 
Acquired customer base, net
132,486

 
140,169

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets
190,614

 
190,717

 
12
Accumulated amortization
(63,412
)
 
(59,985
)
 
 
Acquired trade names and other intangible assets, net
127,202

 
130,732

 
 
 
 
 
 
 
 
Intangible assets, net
$
275,750

 
$
288,911