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Accounting Policies - Derivatives (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Derivative [Line Items] |  |
Change in fair value of derivative instruments | $ 25,152 | $ 1,528
Change in fair value of oil derivative instrument | (750) | (108,300)
Other current and non-current assets | (11,790) | 6,443
Other current and non-current liabilities |  | 39,037
Gains on derivative instruments | (20,418) | 1,068
Other financial items, net | $ (3,339) | (474)
Previously Reported |  |
Derivative [Line Items] |  |
Change in fair value of derivative instruments |  | 0
Change in fair value of oil derivative instrument |  | 0
Other current and non-current assets |  | (105,056)
Other current and non-current liabilities |  | 43,764
Gains on derivative instruments |  | 0
Other financial items, net |  | 594
Restatement Adjustment |  |
Derivative [Line Items] |  |
Change in fair value of derivative instruments |  | 1,528
Change in fair value of oil derivative instrument |  | (108,300)
Other current and non-current assets |  | 111,499
Other current and non-current liabilities |  | (4,727)
Gains on derivative instruments |  | 1,068
Other financial items, net |  | $ (1,068)

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