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Long-term debt: Debt extinguishment and redemption 2021 Notes (Details)
$ in Thousands, € in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
EUR (€)
Jun. 30, 2020
EUR (€)
Jun. 03, 2020
EUR (€)
Jun. 30, 2019
EUR (€)
Long-term debt                
Net proceeds from issuance of senior unsecured 2024 Euro Notes     $ 240,285 $ 152,128        
Senior unsecured 2021 notes                
Long-term debt                
Interest rate (as a percent) 5.625%         5.625%    
Principal amount plus accrued and unpaid interest (as a percent) 100.00%              
Face amount $ 189,200              
Accrued interest $ 1,600              
Senior unsecured 2024 notes                
Long-term debt                
Interest rate (as a percent) 4.375%         4.375%   4.375%
Net proceeds from issuance of senior unsecured 2024 Euro Notes $ 240,300 $ 152,100            
Face amount     $ 410,400   € 350.0 € 135.0 € 215.0 € 135.0
Loss on debt purchase $ 600