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Financial instruments - Categories of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets        
Cash and cash equivalents $ 94,944 [1] $ 77,292 [1] $ 109,295 $ 166,775
Accounts receivable and accrued revenues [1],[2] 60,196 42,212    
Total financial assets 155,140 119,504    
Financial liabilities        
Accounts payable and accrued expenses [1] 28,634 17,427    
Derivative financial liabilities, current [3] 1,250 545    
Current portion long-term debt [1] 93,815 65,053    
Long-term debt [1] 873,460 721,151    
Derivative financial liabilities, non-current [3] 4,486 0    
Total $ 1,001,645 $ 804,177    
[1] Amortized cost.
[2] Cash and cash equivalents include $638 thousand in restricted cash in 2018 and $322 thousand in 2017, including employee withholding tax.
[3] Fair value through profit or loss.