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Debt and Other Obligations - Term Loan (Details)
3 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended
May 11, 2018
USD ($)
Jul. 25, 2014
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2019
USD ($)
Jan. 01, 2015
USD ($)
Jul. 25, 2014
EUR (€)
Line of Credit Facility [Line Items]                            
Repayment of debt     $ 2,055,000 $ 1,987,000 $ 6,077,000 $ 6,034,000                
Finance costs directly expensed     530,000 512,000 1,531,000 1,602,000                
Unrealized loss     60,449,000   60,449,000             $ 34,362,000    
Cross Currency Interest Rate Contract | Cash Flow Hedge | Designated as hedging instrument                            
Line of Credit Facility [Line Items]                            
Notional amount converted into EUR $ 235,000,000.0                          
Currency Swap | Net Investment Hedging | Designated as hedging instrument                            
Line of Credit Facility [Line Items]                            
Notional amount converted into EUR                         $ 180,000,000.0  
Unrealized loss     2,200,000   $ 2,200,000                  
Term Loan | Term Loan Facility                            
Line of Credit Facility [Line Items]                            
Debt face amount   $ 895,000,000.0                        
Required repayment per annum (at least) (as a percent)   1.00%                        
Term loan, maturity date extension         3 years                  
Repricing finance costs directly expensed             $ 700,000 $ 3,500,000 $ 2,100,000          
Finance costs directly expensed     400,000 $ 400,000 $ 1,100,000 $ 1,100,000                
Estimated annual interest expense reduction $ 4,700,000                          
Debt issuance costs     $ 5,300,000   $ 5,300,000             $ 6,100,000    
Term Loan | Term Loan - USD                            
Line of Credit Facility [Line Items]                            
Debt face amount   $ 358,000,000.0                        
Repayment of debt                   $ 58,000,000.0        
Term Loan | Term Loan - USD | LIBOR                            
Line of Credit Facility [Line Items]                            
Basis spread on variable rate         2.00%                  
Variable rate basis floor   1.00%     0.00%                  
Term Loan | Term Loan - USD | Minimum | LIBOR                            
Line of Credit Facility [Line Items]                            
Basis spread on variable rate   3.75%                        
Term Loan | Term Loan - USD | Maximum | LIBOR                            
Line of Credit Facility [Line Items]                            
Basis spread on variable rate   4.00%                        
Term Loan | Term Loan - EUR                            
Line of Credit Facility [Line Items]                            
Debt face amount | €                           € 399,000,000.0
Repayment of debt | €                     € 56,000,000.0      
Term Loan | Term Loan - EUR | EURIBOR                            
Line of Credit Facility [Line Items]                            
Basis spread on variable rate         2.25%                  
Variable rate basis floor   1.00%     0.00%                  
Term Loan | Term Loan - EUR | Minimum | EURIBOR                            
Line of Credit Facility [Line Items]                            
Basis spread on variable rate   3.75%                        
Term Loan | Term Loan - EUR | Maximum | EURIBOR                            
Line of Credit Facility [Line Items]                            
Basis spread on variable rate   4.00%