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DEBT - Narrative (Details)
3 Months Ended
Mar. 08, 2018
USD ($)
bank
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Amortization of principal, percent 12.50%      
Credit agreement, number of banks | bank 3      
Debt issuance costs   $ 583,000   $ 266,000
Credit Facility        
Debt Instrument [Line Items]        
Credit facility, term 5 years      
Write-off of deferred debt issuance cost $ 159,000      
Additional costs incurred 507,000      
Credit Facility | Syndicated Credit Facility 2018        
Debt Instrument [Line Items]        
Maximum borrowing capacity 75,000,000      
Accordion feature   $ 100,000,000    
Credit Facility | U.S. Dollar revolving loan        
Debt Instrument [Line Items]        
Maximum borrowing capacity 50,000,000      
Credit Facility | Alternate currencies revolving loan        
Debt Instrument [Line Items]        
Maximum borrowing capacity 20,000,000     5,000,000
Credit Facility | Alternate currencies revolving loan | Minimum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable interest rate   1.50%    
Credit Facility | Alternate currencies revolving loan | Minimum | Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable interest rate   0.50%    
Credit Facility | Alternate currencies revolving loan | Maximum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable interest rate   3.00%    
Credit Facility | Alternate currencies revolving loan | Maximum | Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable interest rate   2.00%    
Credit Facility | Capital expenditure loan        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 25,000,000      
Credit Facility | German bank line of credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity | €     € 4,000,000  
Available borrowing capacity | €     € 2,783,000  
Credit Facility | Syndicated Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity       30,000,000
Credit Facility | Syndicated Credit Facility 2015        
Debt Instrument [Line Items]        
Maximum borrowing capacity       35,000,000
Accordion feature       $ 25,000,000