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Long-Term Debt - Narrative (Details)
€ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 14, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 03, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Jun. 03, 2019
EUR (€)
Debt Instrument [Line Items]                    
Long-term debt   $ 428,200,000   $ 428,200,000 $ 424,600,000   $ 428,200,000      
Repayments of long-term debt         400,000 $ 1,100,000        
Amortization of deferred financing costs         400,000 $ 600,000        
First Lien Term Facility                    
Debt Instrument [Line Items]                    
Debt instrument, term (years)     7 years              
Repayments of long-term debt       107,700,000            
First Lien Credit Agreement                    
Debt Instrument [Line Items]                    
Debt covenant, restrictive payments $ 10,000,000 $ 7,000,000                
Debt covenant, threshold percentage of debt capacity of cash contributions (percent) 10.00% 7.00%                
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit facility, additional borrowing capacity         95,000,000.0          
Percentage of consolidated EBIDTA             100.00%      
Standby Letters of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity         5,000,000          
Dollar Denominated Line of Credit | First Lien Term Facility                    
Debt Instrument [Line Items]                    
Long-term debt   $ 270,900,000 $ 378,200,000 270,900,000 270,900,000   $ 270,900,000      
Euro Denominated Line of Credit | First Lien Term Facility                    
Debt Instrument [Line Items]                    
Long-term debt   $ 157,300,000 152,600,000 $ 157,300,000 $ 153,700,000   $ 157,300,000 € 139.7 € 139.7 € 140.0
Line of Credit | First Lien Credit Agreement                    
Debt Instrument [Line Items]                    
Debt instrument, covenant, leverage ratio, minimum             5.00      
Debt instrument, interest rate, effective percentage   5.46%   5.46% 4.74%   5.46% 4.74% 5.46%  
Line of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Long-term debt   $ 0   $ 0 $ 0   $ 0      
Line of credit facility, maximum borrowing capacity     $ 45,000,000.0              
Debt instrument, term (years)     5 years              
Long-term line of credit   $ 0   $ 0 $ 0   $ 0      
Line of Credit | Eurodollar Applicable Margin Rate | First Lien Credit Agreement                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (percentage)         3.75%          
Line of Credit | Adjusted Base Rate | First Lien Credit Agreement                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (percentage)         2.75%          
Line of Credit | LIBOR | First Lien Credit Agreement                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (percentage)             400.00%