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