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GOODWILL AND INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets INTANGIBLE ASSETS

The components of intangible assets for each of the years ended December 31, 2019 and 2018, were as follows (amounts in thousands):
 
Weighted- Average Useful Lives (in Years)
 
2019
 
2018
Amortizable intangible assets:
 
 
 
 
 
     Customer relationships
7.7
 
$
12,629

 
$
12,967

     Patents, trademarks, and other
7.8
 
11,598

 
11,356

          Total at cost
 
 
24,227

 
24,323

     Less accumulated amortization
 
 
(14,461
)
 
(12,676
)
 
 
 
$
9,766

 
$
11,647



Amortization related to intangible assets for the years 2019, 2018, and 2017 totaled $2.2 million, $2.3 million, and $3.0 million, respectively.

The estimated aggregate amortization expense at December 31, 2019, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
2020
$
2,179

2021
1,379

2022
987

2023
987

2024
986

Thereafter
3,248

 
$
9,766