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Goodwill And Other Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets
We are required to review goodwill and indefinite-lived intangible assets annually for impairment. Goodwill
impairment is tested at the reporting unit level on an annual basis and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. For the years ended December 31, 2019 and 2018 an assessment for potential impairment was performed and an impairment adjustment was not required.
The following table represents the changes in the carrying value of goodwill and intangibles for the years 2018 and 2019:
 
Total
 
(Dollars in Thousands)
Balance as of December 31, 2017
$
171,117

   Adjustments
—

Balance as of December 31, 2018
171,117

   Adjustments
—

Balance as of December 31, 2019
$
171,117

The following table summarizes acquired intangible assets with determinable useful lives by major category which are included in Other Assets on our Consolidated Balance Sheets:
 
As of December 31, 2019
 
As of December 31, 2018
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
(Dollars in Thousands)
Trade name
$
22,500

 
$
(9,861
)
 
$
12,639

 
$
22,500

 
$
(7,721
)
 
$
14,779

Technology and know-how
55,300

 
(29,112
)
 
26,188

 
55,300

 
(23,503
)
 
31,797

Customer related intangible
64,500

 
(19,473
)
 
45,027

 
64,500

 
(15,070
)
 
49,430

Total finite-lived intangible assets
$
142,300

 
$
(58,446
)
 
$
83,854

 
$
142,300

 
$
(46,294
)
 
$
96,006


Amortization expense of intangible assets was $12.2 million, $12.9 million, $13.6 million in 2019, 2018 and 2017, respectively. Estimated annual amortization expense for the next five years will approximate $11.4 million in 2020, $10.7 million in 2021, $10.1 million in 2022, $9.2 million in 2023 and $8.0 million in 2024.