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Accounting Policies - (Losses) gains on derivative instruments (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
(Losses) gains on derivative instruments $ (12,258) $ 580
Other financial items, net $ 4,621 (4,075)
Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
(Losses) gains on derivative instruments   0
Other financial items, net   (3,495)
Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
(Losses) gains on derivative instruments   580
Other financial items, net   $ (580)