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Long-term debt: Debt extinguishment and redemption 2021 Notes (Details)
$ in Thousands, € in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2019
EUR (€)
Jun. 25, 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%   5.625%    
Senior unsecured 2024 notes                
Long-term debt                
Interest rate (as a percent) 4.375%     4.375%   4.375% 4.375%  
Net proceeds from issuance of senior unsecured 2024 Euro Notes $ 240,300 € 215.0 $ 152,100          
Principal amount plus accrued and unpaid interest (as a percent) 100.00% 100.00%   100.00%        
Principal amount $ 189,200     $ 189,200   € 215.0 € 135.0 € 135.0
Accrued interest 1,600     $ 1,600        
Loss on debt purchase $ 600