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Debt and Other Obligations - Revolving credit facility (Details)
$ in Thousands
12 Months Ended
Apr. 02, 2019
EUR (€)
Apr. 01, 2019
EUR (€)
May 05, 2017
EUR (€)
May 04, 2017
Jul. 25, 2014
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
May 05, 2017
USD ($)
Jul. 25, 2014
USD ($)
Debt Instrument [Line Items]                        
Transaction costs             $ 1,800     $ 2,800    
Amortization of debt issuance costs           $ 2,082 2,220 $ 4,171        
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity | € € 250,000,000.0 € 75,000,000.0 € 175,000,000.0   € 115,000,000.0       € 175,000,000.0      
Transaction costs             2,400     $ 3,400 $ 2,300 $ 3,300
Commitment fee percentage     35.00% 40.00%                
Line of credit, maturity date 3 years                      
Leverage ratio   2.30                    
Amortization of debt issuance costs           $ 700 $ 800          
Revolving Credit Facility | Minimum                        
Debt Instrument [Line Items]                        
Leverage ratio 1.75                      
Revolving Credit Facility | Maximum                        
Debt Instrument [Line Items]                        
Leverage ratio 2.25                      
Revolving Credit Facility | EURIBOR and LIBOR | Minimum                        
Debt Instrument [Line Items]                        
Basis spread on variable rate         2.50%              
Revolving Credit Facility | EURIBOR and LIBOR | Maximum                        
Debt Instrument [Line Items]                        
Basis spread on variable rate         3.00%              
Revolving Credit Facility | Eurodollar                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 0.019% 2.50%                    
Commitment fee percentage 35.00%