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INTANGIBLE ASSETS
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Disclosure [Text Block] INTANGIBLE ASSETS

The components of intangible assets consisted of the following as of the dates set forth below (amounts in thousands):
 
Weighted Average Useful Lives (in years) March 31, 2019
 
March 31,
2019
 
December 31,
2018
Amortizable intangible assets:
 
 
 
 
 
     Customer relationships
8.4
 
$
12,801

 
$
12,967

     Patents, trademarks and other
7.6
 
11,149

 
11,356

          Total at cost
 
 
23,950

 
24,323

     Less accumulated amortization
 
 
(12,621
)
 
(12,676
)
 
 
 
$
11,329

 
$
11,647


   
Amortization related to intangible assets for the three months ended March 31, 2019 and 2018, totaled $0.5 million and $0.7 million, respectively. Intangible assets are included as a component of other assets in the Condensed Consolidated Balance Sheet.

The estimated aggregate amortization expense at March 31, 2019, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
April 1 - December 31, 2019
$
2,139

2020
2,060

2021
1,104

2022
998

2023
998

Thereafter
4,030

 
$
11,329