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Long-term debt (Principal Outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal outstanding $ 631,772  
2027 Notes    
Debt Instrument [Line Items]    
Annual interest rate 5.875%  
Principal outstanding $ 265,000 $ 265,000
2023 Notes    
Debt Instrument [Line Items]    
Annual interest rate 6.625%  
Principal outstanding $ 348,069 $ 348,069