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Corporate debt, Details of corporate debt (Details)
$ in Thousands, € in Millions
1 Months Ended 6 Months Ended 9 Months Ended
Sep. 10, 2019
USD ($)
Apr. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Aug. 02, 2019
USD ($)
Jun. 28, 2019
Jan. 31, 2019
USD ($)
May 10, 2018
USD ($)
Jul. 20, 2017
USD ($)
Jul. 20, 2017
EUR (€)
Nov. 17, 2014
USD ($)
Corporate debt [Abstract]                        
Amount drawn       $ 326,591 $ 73,767              
2019 Notes [Member]                        
Corporate debt [Abstract]                        
Senior notes issued                       $ 255,000
Fixed interest rate                       7.00%
Eurodollar Rate Loans [Member] | LIBOR [Member] | Bottom of Range [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                 1.60%      
Eurodollar Rate Loans [Member] | LIBOR [Member] | Top of Range [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                 2.25%      
Base Rate Loans [Member] | Bottom of Range [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                 0.60%      
Base Rate Loans [Member] | Top of Range [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                 1.00%      
Base Rate Loans [Member] | Federal Funds Rate [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                 0.50%      
Base Rate Loans [Member] | LIBOR [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                 1.00%      
2017 Credit Facility [Member]                        
Corporate debt [Abstract]                        
Maturity date       July 4, 2020                
2017 Credit Facility [Member] | Top of Range [Member]                        
Corporate debt [Abstract]                        
Credit facility amount                   $ 11,400 € 10  
2017 Credit Facility [Member] | EURIBOR [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                   2.25% 2.25%  
2017 Credit Facility [Member] | LIBOR [Member]                        
Corporate debt [Abstract]                        
Adjustment to interest rate                   2.25% 2.25%  
New Revolving Credit Facility [Member]                        
Corporate debt [Abstract]                        
Credit facility amount       $ 70,000   $ 425,000   $ 300,000 $ 215,000      
Amount drawn $ 19,000   $ 73,000                  
New Revolving Credit Facility [Member] | Maturity December 31, 2022 [Member]                        
Corporate debt [Abstract]                        
Maturity date       December 31, 2022                
Credit facility amount           387,500            
New Revolving Credit Facility [Member] | Maturity December 31, 2021 [Member]                        
Corporate debt [Abstract]                        
Maturity date       December 31, 2021                
Credit facility amount           $ 37,500            
2019 Note Issuance Facility [Member]                        
Corporate debt [Abstract]                        
Maturity date       April 30, 2025                
Credit facility amount | €   € 268                    
Upfront fee percentage   2.00%                    
Interest capitalization period   2 years                    
2019 Note Issuance Facility [Member] | Interest Rate Swap [Member]                        
Corporate debt [Abstract]                        
Fixed interest rate             4.40%          
Maturity date       June 30, 2022                
2019 Note Issuance Facility [Member] | EURIBOR [Member]                        
Corporate debt [Abstract]                        
Variable interest period   3 months                    
Adjustment to interest rate   4.65%