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Debt - Narrative (Details)
3 Months Ended
Jul. 31, 2015
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 23, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Credit facility            
Long term debt, gross   $ 406,420,000        
Amortization of deferred financing costs   577,000 $ 630,000      
Mark-to-market adjustment   $ 943,000        
Excess cash flows, repayment of debt, percentage   50.00%        
Excess cash flows threshold for dividends   $ 5,000,000.0        
Interest rate swap | Derivative financial instruments, liabilities            
Credit facility            
Mark-to-market adjustment   943,000        
Term loan            
Credit facility            
Face amount $ 425,000,000.0     € 1,000,000.0    
Interest rate       1.50%    
Fair value of debt   315,800,000        
Debt issuance costs incurred $ 12,900,000 12,900,000        
Deferred issuance costs, net   3,297,000     $ 3,886,000  
Amortization per year (as a percent) 1.00%          
Long term debt, gross   404,800,000        
Amortization of deferred financing costs   600,000 $ 600,000      
Term loan | Prepayment due to Excess Cash Flow provision            
Credit facility            
Repayments of principal in next 12 months   0        
Revolving loan            
Credit facility            
Debt issuance costs incurred $ 1,300,000          
Maximum borrowing available $ 25,000,000.0         $ 12,500,000
Long term debt, gross   0        
Letter-of-credit sub-facility            
Credit facility            
Maximum borrowing available   $ 30,000.00       $ 10,000,000.0
Credit Facility | Alternate base rate            
Credit facility            
Margin of interest (as a percent) 3.75%          
Credit Facility | LIBOR            
Credit facility            
Margin of interest (as a percent) 4.75%          
Variable rate base minimum (as a percent) 1.00%