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Long‑Term Debt - Narrative (Details)
3 Months Ended 9 Months Ended
Dec. 19, 2017
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 02, 2020
USD ($)
Apr. 02, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Total carrying value of debt   $ 589,583,000   $ 589,583,000         $ 233,750,000
Amortization of deferred debt issuance costs       430,000 $ 415,000        
Interest expense other borrowings   15,000 $ 13,000 40,000 $ 157,000        
Interest Rate Swap | Not Designated as Hedging Instrument                  
Debt Instrument [Line Items]                  
Derivative notional amount             $ 200,000,000 $ 200,000,000  
Derivative fair value   $ 3,365,000   $ 3,365,000          
Credit Facility                  
Debt Instrument [Line Items]                  
Weighted average interest rate over time   1.59% 3.43% 1.92% 3.63%        
Accrued interest and fees   $ 26,000   $ 26,000         0
Interest expense for debt   1,807,000 $ 2,305,000 4,351,000 $ 6,905,000        
Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Borrowings guaranteed through stock of foreign subsidiaries (as a percent) 0.65                
Credit Facility | Letters of Credit And Surety Bonds                  
Debt Instrument [Line Items]                  
Total carrying value of debt   150,000   150,000         546,000
Credit Facility | Minimum | Revolving Credit Facility - Non-Euro Currency                  
Debt Instrument [Line Items]                  
Unused capacity, commitment fee percentage 0.15%                
Credit Facility | Maximum | Revolving Credit Facility - Non-Euro Currency                  
Debt Instrument [Line Items]                  
Unused capacity, commitment fee percentage 0.30%                
Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility - Non-Euro Currency                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.00%                
Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility - Euro Currency                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.00%                
Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility - Euro Currency                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.25%                
Credit Facility | Overnight Bank Funding Effective Rate | Revolving Credit Facility - Non-Euro Currency                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 0.50%                
Credit Facility | Base Rate | Minimum | Revolving Credit Facility - Non-Euro Currency                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 0.00%                
Credit Facility | Base Rate | Maximum | Revolving Credit Facility - Non-Euro Currency                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%                
Term Loan | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Amortization of deferred debt issuance costs   153,000 $ 138,000 430,000 $ 415,000        
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Total carrying value of debt   465,000,000   465,000,000         233,750,000
Accordion feature, increase limit $ 100,000,000                
Line of Credit | Credit Facility                  
Debt Instrument [Line Items]                  
Remaining borrowing capacity   34,850,000   34,850,000         265,704,000
Effective interest rate             0.73%    
Line of Credit | Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 500,000,000                
Line of Credit | Credit Facility | Letter of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 50,000,000                
Line of Credit | Credit Facility | Bridge Loan                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 50,000,000                
Line of Credit | Term Loan | Secured Debt                  
Debt Instrument [Line Items]                  
Debt instrument, face amount           $ 125,000,000      
Total carrying value of debt   124,583,000   124,583,000   $ 417,000     $ 0
Debt issuance costs   $ 432,000   $ 432,000