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Acquired Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Acquired Intangible Assets [Abstract] |
Acquired Intangible Assets | Note 7. Acquired Intangible Assets Acquired identifiable intangible assets consist of the following:
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | (In thousands) |
Customer relationships |  | $ | 157,119 |  |  | $ | 111,701 |
Patents, developed technology and intellectual property |  |  | 14,123 |  |  |  | 723 |
Trademarks and trade names |  |  | 8,880 |  |  |  | 6,980 |
Non-compete agreements |  |  | 3,280 |  |  |  | 3,272 |
Supply agreements |  |  | 800 |  |  |  | 800 |
Leaseholds |  |  | 160 |  |  |  | 160 |
Total acquired intangible assets |  |  | 184,362 |  |  |  | 123,636 |
Less accumulated amortization (1) |  |  | (76,491 | ) |  |  | (70,221 | )
Net acquired intangible assets |  | $ | 107,871 |  |  | $ | 53,415 |
| (1) | Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which have indefinite useful lives and, as such, are not being amortized.
Total amortization expense for acquired intangible assets was $2.4 million and $6.5 million for the three months and nine months ended September 30, 2021, respectively, and $2 million and $6.1 million for the comparable periods in 2020. Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $2.2 million for the remainder of 2021, $8.6 million in 2022, $8.3 million in 2023, $8.2 million in 2024 and $78 million in the aggregate for the years 2025 through 2041. For information related to identified intangible assets acquired in the Stabil, Trombetta, and Soot Sensor acquisitions, see Note 3, “Business Acquisitions and Investments,” of the notes to our consolidated financial statements (unaudited).

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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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