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DEBT - Narrative (Details)
3 Months Ended 12 Months Ended
Jun. 25, 2020
USD ($)
Mar. 08, 2018
USD ($)
bank
Jun. 30, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
EUR (€)
Oct. 22, 2020
USD ($)
Jul. 31, 2020
EUR (€)
Debt Instrument [Line Items]                
Debt instrument, annual principal payment, percent of principal   12.50%            
Line of credit facility, number of banks | bank   3            
Maximum amount of shares authorized to sell (in shares)             $ 75,000,000  
Outstanding borrowings       $ 11,750,000 $ 14,875,000      
Net deferred debt issuance costs       486,000 603,000      
Capital expenditure facility                
Debt Instrument [Line Items]                
Outstanding borrowings       $ 11,750,000 14,875,000      
Minimum | Syndicated Credit Facility Amendment                
Debt Instrument [Line Items]                
Debt instrument, covenant, debt service coverage ratio     1.35          
Line of credit                
Debt Instrument [Line Items]                
Line of credit facility, expiration period   5 years            
Line of credit | Syndicated credit facility 2015                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 75,000,000            
Accordion feature   100,000,000            
Line of credit | U.S. Dollar revolving loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity   50,000,000            
Line of credit | Syndicated credit agreement, alternate currencies loans                
Debt Instrument [Line Items]                
Maximum borrowing capacity   20,000,000            
Line of credit | Syndicated credit agreement, alternate currencies loans | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 1.75%              
Fixed interest rate 0.75%              
Line of credit | Syndicated credit agreement, alternate currencies loans | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 0.75%              
Line of credit | Capital expenditure facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 25,000,000            
Prepayment on line of credit         $ 7,000,000      
Line of credit | Syndicated Credit Facility Amendment                
Debt Instrument [Line Items]                
Minimum liquidity covenant $ 10,000              
Line of credit | German Bank Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €     € 4,000         € 7,000,000
Line of credit | Commerzbank line of credit                
Debt Instrument [Line Items]                
Outstanding borrowings | €           € 0    
Amount of bank guarantees secured by line of credit | €           € 3,676,000    
Line of credit | Commerzbank line of credit | EURIBOR                
Debt Instrument [Line Items]                
Interest rate at end of period       4.50%   4.50%    
Line of credit | Minimum | Syndicated credit agreement, alternate currencies loans | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 1.75%     1.50%        
Line of credit | Minimum | Syndicated credit agreement, alternate currencies loans | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 0.75%     0.50%        
Line of credit | Maximum | Syndicated credit agreement, alternate currencies loans | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 3.00%     3.00%        
Line of credit | Maximum | Syndicated credit agreement, alternate currencies loans | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 2.00%     2.00%