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GOODWILL AND INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of detail and activity of goodwill by segment
Detail and activity of goodwill by segment is presented below (in thousands):
 
MMS
 
ATA
 
Total
Goodwill
$
32,434

 
$
6,677

 
$
39,111

Accumulated impairment losses
(32,434
)
 
—

 
(32,434
)
Balance at December 31, 2017
—

 
6,677

 
6,677

 
 
 
 
 
 
Goodwill
32,434

 
6,677

 
39,111

Currency translation adjustments
—

 
(31
)
 
(31
)
Accumulated impairment losses
(32,434
)
 
—

 
(32,434
)
Balance at March 31, 2018
$
—

 
$
6,646

 
$
6,646
Summary of the major components of intangible assets other than goodwill
The major components of intangible assets other than goodwill are as follows (in thousands):
 
March 31,
2018
 
December 31,
2017
Gross amortizable intangible assets:
 

 
 

Technical know-how
$
12,989

 
$
12,997

Customer lists
9,017

 
9,026

Land rights
2,765

 
2,667

Patents, trade names, drawings, and other
4,446

 
4,420

Total gross amortizable intangible assets
29,217

 
29,110

 
 
 
 
Accumulated amortization:
 

 
 

Technical know-how
(8,187
)
 
(8,067
)
Customer lists
(2,316
)
 
(2,204
)
Land rights
(406
)
 
(378
)
Patents, trade names, drawings, and other
(3,717
)
 
(3,670
)
Total accumulated amortization
(14,626
)
 
(14,319
)
Amortizable intangible assets, net
14,591

 
14,791

 
 
 
 
Indefinite lived intangible assets:
 

 
 

Trade names
11,749

 
11,595

 
 
 
 
Intangible assets other than goodwill, net
$
26,340

 
$
26,386
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
Amortization expense related to the definite-lived intangible assets are as follows (in thousands):
 
Three Months Ended 
 March 31,
 
2018
 
2017
Amortization expense
$
277

 
$
312