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Acquired Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Acquired Intangible Assets [Abstract] |
Acquired Intangible Assets | Note 8. Acquired Intangible Assets Acquired identifiable intangible assets consist of the following:
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | (In thousands) |
Customer relationships |  | $ | 87,256 |  |  | $ | 87,195 |
Trademarks and trade names |  |  | 6,800 |  |  |  | 6,800 |
Non-compete agreements |  |  | 3,193 |  |  |  | 3,193 |
Patents |  |  | 723 |  |  |  | 723 |
Supply agreements |  |  | 800 |  |  |  | 800 |
Leaseholds |  |  | 160 |  |  |  | 160 |
Total acquired intangible assets |  |  | 98,932 |  |  |  | 98,871 |
Less accumulated amortization (1) |  |  | (53,184 | ) |  |  | (51,391 | )
Net acquired intangible assets |  | $ | 45,748 |  |  | $ | 47,480 |
| (1) | Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.
Total amortization expense for acquired intangible assets was $1.8 million and $1.9 million for the three months ended March 31, 2019 and 2018, respectively. Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $4.6 million for the remainder of 2019, $5.9 million in 2020, $4.5 million in 2021, $3 million in 2022 and $22.5 million in the aggregate for the years 2023 through 2031.

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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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