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Accounting Policies - Derivatives (Details) - USD ($) $ in Thousands | 9 Months Ended
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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

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