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DEBT - Narrative (Details)
3 Months Ended
Dec. 23, 2021
USD ($)
bank
Mar. 31, 2022
USD ($)
Mar. 31, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Mar. 31, 2021
USD ($)
Jul. 31, 2020
EUR (€)
Debt Instrument [Line Items]              
Outstanding borrowings   $ 146,250,000   $ 150,000,000      
Debt issuance costs   2,540,000   2,575,000   $ 2,575,000  
Syndicated Credit Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Outstanding borrowings   0   0      
Syndicated Credit Facility | Secured Debt              
Debt Instrument [Line Items]              
Outstanding borrowings   146,250,000   150,000,000      
Commerzbank Line of Credit              
Debt Instrument [Line Items]              
Outstanding borrowings   $ 0   $ 0      
Credit Facility | Syndicated Credit Facility              
Debt Instrument [Line Items]              
Credit facility, term 5 years            
Maximum borrowing capacity $ 200,000,000            
Amortization of principal, percent 10.00%            
Accordion feature $ 100,000,000            
Credit agreement, number of banks | bank 4            
Debt instrument, covenant, debt service coverage ratio   1.35          
Credit Facility | Syndicated Credit Facility | Through Quarter Ended March 31, 2022              
Debt Instrument [Line Items]              
Line of credit facility, maximum leverage ratio   3.5          
Credit Facility | Syndicated Credit Facility | Quarter Ended June 30, 2022 Through Quarter March 31, 2023              
Debt Instrument [Line Items]              
Line of credit facility, maximum leverage ratio   3.25          
Credit Facility | Syndicated Credit Facility | Quarter Ended June 30, 2023 And Thereafter              
Debt Instrument [Line Items]              
Line of credit facility, maximum leverage ratio   3.0          
Credit Facility | Syndicated Credit Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 50,000,000            
Credit Facility | Syndicated Credit Facility | Secured Debt              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 150,000,000            
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 | German Bank Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity | €             € 7,000,000
Credit Facility | Commerzbank Line of Credit              
Debt Instrument [Line Items]              
Outstanding borrowings | €     € 0   € 0    
Amount of bank guarantees secured by line of credit | €     € 2,609,000   € 2,997,000