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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2020
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | NOTE 9—INTANGIBLE ASSETS The carrying amount of intangible assets, net of accumulated amortization and impairment charges, as of December 31, 2020 and 2019 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 2020 | ​
​ | ​ | ​ | ​ |  | Gross |  |  | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
​ | Estimated | ​ | Carrying | ​ | ​ | ​ | ​ | Accumulated | ​ | Currency | ​ | Net Book | ​
​ | Useful Lives | ​ | Amount | ​ | Acquisitions | ​ | Amortization | ​ | impact | ​ | Value | ​
Amortizable intangibles: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships | 2 to 15 |  | years | ​ | $ | 73,723 | ​ | $ | 1,560 | ​ | $ | (66,705) | ​ | $ | (108) | ​ | $ | 8,470 | ​
Noncompete agreements | 4 to 7 | ​ | years | ​ |  | 5,952 | ​ |  | 10 | ​ |  | (5,911) | ​ | ​ | — | ​ |  | 51 | ​
Software | 3 to 4 | ​ | years | ​ |  | 1,500 | ​ |  | 160 | ​ |  | (1,511) | ​ | ​ | — | ​ |  | 149 | ​
Backlog | 1 to 2 | ​ | years | ​ |  | 5,002 | ​ |  | — | ​ |  | (4,981) | ​ | ​ | (21) | ​ |  | — | ​
Databases | 4 to 15 | ​ | years | ​ |  | 13,218 | ​ |  | — | ​ |  | (6,852) | ​ | ​ | (172) | ​ |  | 6,194 | ​
Trademark and trade names | 5 | ​ | years | ​ |  | 1,250 | ​ |  | 240 | ​ |  | (1,290) | ​ | ​ | — | ​ |  | 200 | ​
Intangibles | ​ | ​ | ​ | ​ | $ | 100,645 | ​ | $ | 1,970 | ​ | $ | (87,250) | ​ | $ | (301) | ​ | $ | 15,064 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 2019 |
​ | ​ | ​ | ​ |  | Gross |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
​ | Estimated | ​ | Carrying | ​ | ​ | ​ | ​ | Accumulated | ​ | Currency | ​ | Net Book |
​ | Useful Lives | ​ | Amount |  | Acquisitions | ​ | 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 | ​
​ Amortization expense was $3.5 million and $4.0 million for the years ended December 31, 2020 and 2019, respectively. The estimated future amortization expense subsequent to December 31, 2020, is as follows: ​
​ | ​ | ​ | ​ | ​
2021 |  | $ | 2,642 |
2022 | ​ |  | 2,110 | ​
2023 | ​ |  | 1,814 | ​
2024 | ​ |  | 1,495 | ​
2025 | ​ | ​ | 1,326 | ​
Thereafter | ​ |  | 5,677 | ​
​ | ​ | $ | 15,064 | ​
​

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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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