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Corporate debt, Details of corporate debt (Details)
$ in Thousands, € in Millions
1 Months Ended 6 Months Ended
Aug. 02, 2019
USD ($)
Apr. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
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     $ 308,981 $ 73,767            
Subsequent Events [Member]                    
Corporate debt [Abstract]                    
Credit facility amount $ 425,000                  
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]                    
Maturity date     December 31, 2021              
Credit facility amount     $ 70,000     $ 300,000 $ 215,000      
Amount drawn     $ 73,000              
New Revolving Credit Facility [Member] | Subsequent Events [Member]                    
Corporate debt [Abstract]                    
Maturity date December 31, 2022                  
Credit facility amount $ 425,000                  
New Revolving Credit Facility [Member] | Subsequent Events [Member] | Maturity December 31, 2022 [Member]                    
Corporate debt [Abstract]                    
Credit facility amount 387,500                  
New Revolving Credit Facility [Member] | Subsequent Events [Member] | Maturity December 31, 2021 [Member]                    
Corporate debt [Abstract]                    
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%