Annual report pursuant to Section 13 and 15(d)

Intangible Assets

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Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
The following table summarizes acquired intangible assets at December 31 as follows:
  2019 2018
(In thousands)
Weighted
Average Life
Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Patents 11 years $ 2,146    $ 1,804    $ 2,146    $ 1,716   
Non-compete Agreement 4 years 11,318    7,696    10,900    4,680   
Trade Names 10 years 11,438    6,550    11,454    5,182   
Completed and Unpatented Technology 9 years 48,201    21,196    36,406    14,964   
Customer Relationships 15 years 142,212    50,776    136,894    37,875   
Total Intangible Assets 12 years $ 215,315    $ 88,022    $ 197,800    $ 64,417   
Additionally, net Intangible Assets of $0.7 million are classified in Assets Held for Sale at December 31, 2018. Refer to Note 22.
Amortization is computed on the straight line method for financial reporting purposes. Amortization expense for intangibles was $17.6 million, $19.4 million and $12.3 million for 2019, 2018 and 2017, respectively. Additionally, there was a $6.2 million impairment of intangible assets as more fully described in Note 23. The amount is classified within Impairment Loss in the Consolidated Statement of Operations.
Based upon acquired intangible assets at December 31, 2019, amortization expense for each of the next five years is estimated to be:
(In thousands)  
2020 $ 16,620   
2021 $ 15,394   
2022 $ 14,963   
2023 $ 13,927   
2024 $ 12,908