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INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block] The components of intangible assets for each of the years ended December 31, 2017 and 2016, were as follows (amounts in thousands):
 
Weighted- Average Useful Lives (in Years)
 
2017
 
2016
Amortizable intangible assets:
 
 
 
 
 
     Customer relationships
9.7
 
$
13,922

 
$
13,171

     Patents, trademarks, and other
7.4
 
15,208

 
14,629

          Total at cost
 
 
29,130

 
27,800

     Less accumulated amortization
 
 
(13,855
)
 
(11,399
)
 
 
 
$
15,275

 
$
16,401
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] The estimated aggregate amortization expense at December 31, 2017, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
2018
$
2,397

2019
2,237

2020
2,237

2021
1,543

2022
1,053

Thereafter
5,808

 
$
15,275