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DEBT - Narrative (Details)
9 Months Ended
Mar. 08, 2018
USD ($)
bank
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Amortization of principal, percent 12.50%        
Credit agreement, number of banks | bank 3        
Debt issuance costs   $ 815,000     $ 266,000
Debt issuance costs, amount paid by company   $ 310,000 $ 133,000    
Credit Facility          
Debt Instrument [Line Items]          
Credit facility, term 5 years        
Write-off of deferred debt issuance cost $ 159,000        
Additional costs incurred 817,000        
Debt issuance costs, amount paid by administrative assistant 507,000        
Debt issuance costs, amount paid by company 310,000        
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 | €       € 1,827,000  
Credit Facility | Syndicated Credit Facility 2015          
Debt Instrument [Line Items]          
Maximum borrowing capacity         35,000,000
Accordion feature         25,000,000
Credit Facility | Syndicated Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 30,000,000