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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS

Intangible assets consist of the following (in thousands, except amortization period data):
 
 
December 31,
 
Weighted- Average
Amortization Period
(in years)
 
2019
 
2018
 
Acquired technology and data
105,168

 
103,128

 
5
Accumulated amortization
(90,542
)
 
(85,344
)
 
 
Acquired technology, net
14,626

 
17,784

 
 
 
 
 
 
 
 
Acquired customer base
487,532

 
339,574

 
11
Accumulated amortization
(233,202
)
 
(199,405
)
 
 
Acquired customer base, net
254,330

 
140,169

 
 
 
 
 
 
 
 
Acquired trade names and other intangible assets
236,358

 
199,752

 
12
Accumulated amortization
(84,118
)
 
(68,794
)
 
 
Acquired trade names and other intangible assets, net
152,240

 
130,958

 
 
 
 
 
 
 
 
Intangible assets, net
$
421,196

 
$
288,911

 
 


Amortization expense for intangible assets was approximately $55 million, $52 million and $37 million for the years ended December 31, 2019, 2018 and 2017, respectively.
 
In the aggregate, the Company expects the future amortization expense for intangible assets existing as of December 31, 2019 to be approximately $72 million, $61 million, $51 million, $45 million and $39 million for the years ending December 31, 2020, 2021, 2022, 2023 and 2024, respectively.

Intangible assets are reviewed for impairment at least annually and more frequently whenever events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. No impairments of the Company's intangible assets were recognized during the years ended December 31, 2019, 2018 and 2017.