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INTANGIBLE ASSETS | 12 Months Ended
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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.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- References No definition available. + Details
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