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INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block] 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
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] 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