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Debt and Other Obligations - Term Loan (Details)
3 Months Ended 12 Months Ended 36 Months Ended
May 11, 2018
USD ($)
Jul. 25, 2014
EUR (€)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2015
USD ($)
Jul. 25, 2014
USD ($)
Line of Credit Facility [Line Items]                        
Repayment of debt     $ 2,006,000 $ 2,018,000                
Finance costs directly expensed     501,000 535,000                
Unrealized loss     57,206,000             $ 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                  
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     $ 300,000 $ 300,000                
Estimated annual interest expense reduction $ 4,700,000                      
Debt issuance costs     $ 5,700,000             $ 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%