Annual report pursuant to Section 13 and 15(d)

Intangible Assets

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Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
The following table summarizes acquired intangible assets at December 31 as follows:
  2018  2017 
(In thousands)
Weighted
Average Life
Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Patents 11 Years $ 2,146  $ 1,716  $ 2,146  $ 1,629 
Non-compete Agreement 4 Years 10,900  4,680  10,900  1,687 
Trade Names 10 Years 11,454  5,182  11,492  4,114 
Completed and Unpatented Technology 10 Years 36,406  14,964  38,114  11,931 
Backlog 1 Years 8,790  8,790  14,424  12,184 
Customer Relationships 15 Years 136,894  37,875  137,967  30,005 
Total Intangible Assets 13 Years $ 206,590  $ 73,207  $ 215,043  $ 61,550 
Additionally, net Intangible Assets of $651 are classified in Assets Held for Sale at December 31, 2018. Refer to Note 21.
Amortization is computed on the straight-line method for financial reporting purposes, with the exception of backlog, which is amortized based on the expected realization period of the acquired backlog. Amortization expense for intangibles was $19.4 million, $12.3 million and $10.8 million for 2018, 2017 and 2016, respectively.
Based upon acquired intangible assets at December 31, 2018, amortization expense for each of the next five years is estimated to be:
(In thousands)  
2019 $ 16,582 
2020 $ 15,909 
2021 $ 14,000 
2022 $ 13,576 
2023 $ 12,409