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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2019
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | NOTE 8—INTANGIBLE ASSETS The carrying amount of intangible assets, net of accumulated amortization and impairment charges, as of December 31, 2019 and 2018 consisted of the following:
|  |  |  |  | 2019 |
|  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |
| Estimated |  | Carrying |  | Accumulated |  | Currency |  | Net Book |
| Useful Lives |  | Amount |  | Amortization |  | impact |  | Value |
Amortizable intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 2 to 15 |  | years |  | $ | 73,723 |  | $ | (63,761) |  | $ | (116) |  | $ | 9,846 |
Noncompete agreements | 4 to 7 |  | years |  |  | 5,952 |  |  | (5,862) |  |  | 1 |  |  | 91 |
Software | 3 to 4 |  | years |  |  | 1,500 |  |  | (1,500) |  |  | — |  |  | — |
Backlog | 1 to 2 |  | years |  |  | 5,002 |  |  | (4,981) |  |  | (21) |  |  | — |
Databases | 4 to 15 |  | years |  |  | 13,218 |  |  | (6,364) |  |  | (186) |  |  | 6,668 |
Trademark and trade names | 5 |  | years |  |  | 1,250 |  |  | (1,250) |  |  | — |  |  | — |
Intangibles |  |  |  |  | $ | 100,645 |  | $ | (83,718) |  | $ | (322) |  | $ | 16,605 |
|  |  |  |  | 2018 |
|  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |
| Estimated |  | Carrying |  | Accumulated |  | Currency |  | Net Book |
| Useful Lives |  | Amount |  | Amortization |  | impact |  | Value |
Amortizable intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 2 to 15 |  | years |  | $ | 73,723 |  | $ | (60,256) |  | $ | (112) |  | $ | 13,355 |
Noncompete agreements | 4 to 7 |  | years |  |  | 5,952 |  |  | (5,812) |  |  | 1 |  |  | 141 |
Software | 3 to 4 |  | years |  |  | 1,500 |  |  | (1,500) |  |  | — |  |  | — |
Backlog | 1 to 2 |  | years |  |  | 5,002 |  |  | (4,981) |  |  | (21) |  |  | — |
Databases | 4 to 15 |  | years |  |  | 13,218 |  |  | (5,908) |  |  | (184) |  |  | 7,126 |
Trademark and trade names | 5 |  | years |  |  | 1,250 |  |  | (1,250) |  |  | — |  |  | — |
Intangibles |  |  |  |  | $ | 100,645 |  | $ | (79,707) |  | $ | (316) |  | $ | 20,622 |
Amortization expense was $4.0 million and $5.0 million for the years ended December 31, 2019 and 2018, respectively. The estimated future amortization expense subsequent to December 31, 2019, is as follows:
2020 |  | $ | 3,418 |
2021 |  |  | 2,062 |
2022 |  |  | 1,673 |
2023 |  |  | 1,421 |
2024 |  |  | 1,193 |
Thereafter |  |  | 6,838 |
|  | $ | 16,605 |

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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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