| Intangible Assets | Intangible Assets 
The following table summarizes acquired intangible assets as follows:
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | July 3, 2021 |  | December 31, 2020 |  
| (In thousands) | Weighted Average Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  
| Patents | 11 years |  | $ | 2,146 |  |  | $ | 1,935 |  |  | $ | 2,146 |  |  | $ | 1,891 |  |  
| Non-compete Agreement | 4 years |  | 11,082 |  |  | 10,339 |  |  | 11,082 |  |  | 10,085 |  |  
| Trade Names | 10 years |  | 11,484 |  |  | 8,031 |  |  | 11,512 |  |  | 7,537 |  |  
| Completed and Unpatented Technology | 9 years |  | 47,995 |  |  | 28,112 |  |  | 48,043 |  |  | 25,766 |  |  
| Customer Relationships | 15 years |  | 142,390 |  |  | 64,585 |  |  | 142,478 |  |  | 60,096 |  |  
| Total Intangible Assets | 12 years |  | $ | 215,097 |  |  | $ | 113,002 |  |  | $ | 215,261 |  |  | $ | 105,375 |  |  
All acquired intangible assets other than goodwill and one trade name are being amortized. Amortization expense for acquired intangibles is summarized as follows:
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Six Months Ended |  | Three Months Ended |  
| (In thousands) |  | July 3, 2021 |  | June 27, 2020 |  | July 3, 2021 |  | June 27, 2020 |  
| Amortization Expense |  | $ | 7,712 |  |  | $ | 8,642 |  |  | $ | 3,857 |  |  | $ | 4,377 |  |  
Amortization expense for acquired intangible assets expected for 2021 and for each of the next five years is summarized as follows:
|  |  |  |  |  |  |  
| (In thousands) |  |  
| 2021 | $ | 15,371 |  |  
| 2022 | $ | 14,911 |  |  
| 2023 | $ | 13,878 |  |  
| 2024 | $ | 12,856 |  |  
| 2025 | $ | 10,935 |  |  
| 2026 | $ | 9,533 |  |  |