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Long-term debt (Additional Required Disclosures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
2027 Notes      
Debt Instrument [Line Items]      
Interest expense, debt $ 15,569 $ 11,547 $ 0
DFC Amortization 299 224 0
Amortization of Discount, net 0 0 0
2023 Notes      
Debt Instrument [Line Items]      
Interest expense, debt 23,060 23,885 28,516
DFC Amortization 323 610 943
Amortization of Discount, net 397 752 1,157
2016 Notes      
Debt Instrument [Line Items]      
Interest expense, debt 0 0 6,668
DFC Amortization 0 0 391
Amortization of Discount, net 0 0 (266)
Subsidiaries | Secured Debt      
Debt Instrument [Line Items]      
Interest expense, debt 0 2,570 6,519
DFC Amortization 0 3,251 814
Amortization of Discount, net $ 0 $ 2,249 $ 0