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GOODWILL AND INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets INTANGIBLE ASSETS

The components of intangible assets for each of the years ended December 31, 2018 and 2017, were as follows (amounts in thousands):
 
Weighted- Average Useful Lives (in Years)
 
2018
 
2017
Amortizable intangible assets:
 
 
 
 
 
     Customer relationships
8.7
 
$
12,967

 
$
13,922

     Patents, trademarks, and other
7.7
 
11,356

 
15,208

          Total at cost
 
 
24,323

 
29,130

     Less accumulated amortization
 
 
(12,676
)
 
(13,855
)
 
 
 
$
11,647

 
$
15,275



Amortization related to intangible assets for the years 2018, 2017, and 2016 totaled $2.3 million, $3.0 million, and $2.2 million, respectively.

The estimated aggregate amortization expense at December 31, 2018, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
2019
$
2,123

2020
2,049

2021
1,393

2022
1,042

2023
1,042

Thereafter
3,998

 
$
11,647