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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:
 20192018
(In thousands)
Weighted
Average Life
Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Patents11 years$2,146  $1,804  $2,146  $1,716  
Non-compete Agreement4 years11,318  7,696  10,900  4,680  
Trade Names10 years11,438  6,550  11,454  5,182  
Completed and Unpatented Technology9 years48,201  21,196  36,406  14,964  
Customer Relationships15 years142,212  50,776  136,894  37,875  
Total Intangible Assets12 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