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Accounting Policies - Derivatives (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
(Losses)/gains on derivative instruments $ (38,037) $ (6,936)
Other financial items, net (4,317) (701)
Change in fair value of derivative instruments 43,735 6,936
Accrued expenses $ (48,116) 15,003
Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
(Losses)/gains on derivative instruments   (12,258)
Other financial items, net   4,621
Change in fair value of derivative instruments   12,258
Accrued expenses   9,681
Restatement Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
(Losses)/gains on derivative instruments   5,322
Other financial items, net   (5,322)
Change in fair value of derivative instruments   (5,322)
Accrued expenses   $ 5,322