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ACQUISITION (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 06, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ACQUISITION          
Cash paid for acquisition, gross   $ 77,413   $ 16,205  
Goodwill   52,639 $ 29,531 $ 27,522 $ 17,757
Pro forma Condensed Combined Financial Information          
Revenues   351,952 286,327    
Net income   $ 17,830 $ 8,101    
Diluted net income per share (in dollars per share)   $ 1.90 $ 0.87    
TCI          
ACQUISITION          
Business acquisition percentage of voting interests acquired 100.00%        
Acquisition cost $ 64,100        
Transaction costs related to acquisition 413        
Inventory 4,332        
Accounts receivable 5,822        
Other assets, net 303        
Property, plant and equipment 3,464        
Amortizable intangible assets 36,400        
Goodwill 17,843        
Current liabilities (4,064)        
Fair value of net assets acquired and liabilities assumed $ 64,100        
TCI | Customer lists          
ACQUISITION          
Amortization period (in years)   16 years      
TCI | Technology          
ACQUISITION          
Amortization period (in years)   15 years      
TCI | Trade name          
ACQUISITION          
Amortization period (in years)   19 years