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DEBT - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 25, 2020
USD ($)
Mar. 08, 2018
USD ($)
bank
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
EUR (€)
Debt Instrument [Line Items]            
Amortization of principal, percent   12.50%        
Credit agreement, number of banks | bank   3        
Debt issuance costs     $ 593,000 $ 593,000 $ 603,000  
Syndicated Credit Facility Amendment | Minimum            
Debt Instrument [Line Items]            
Coverage ratio     1.35      
Credit Facility            
Debt Instrument [Line Items]            
Credit facility, term   5 years        
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        
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 | Minimum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable interest rate       1.50%    
Credit Facility | Alternate Currencies Revolving Loan | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable interest rate       2.00%    
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 | Capital expenditure facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 25,000,000        
LIBOR-based variable rate     2.49% 2.49%   2.49%
Line of credit facility, prepayment amount         $ 7,000,000  
Credit Facility | Syndicated Credit Facility Amendment            
Debt Instrument [Line Items]            
Minimum liquidity covenant $ 10,000,000          
Credit Facility | Syndicated Credit Facility Amendment | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable interest rate 0.75%          
Credit Facility | Syndicated Credit Facility Amendment | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable interest rate 1.75%          
Credit Facility | Syndicated Credit Facility Amendment | Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable interest rate 0.75%          
Credit Facility | Syndicated Credit Facility Amendment | Minimum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable interest rate 1.75%          
Fixed interest rate 0.75%          
Credit Facility | Syndicated Credit Facility Amendment | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable interest rate 2.00%          
Credit Facility | Syndicated Credit Facility Amendment | Maximum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable interest rate 3.00%          
Credit Facility | German Bank Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity | €           € 4,000,000
Available borrowing capacity | €           € 243,000