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Accounting Policies - Changes in fair value of derivative instruments and oil derivative instrument (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Change in fair value of derivative instruments |  | $ 12,258 | $ (580)
Other current and non-current assets | [1] | 3,482 | (2,596)
Other current and non-current liabilities | [1] | $ 39,099 | 16,396
Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Change in fair value of derivative instruments |  |  | 0
Other current and non-current assets |  |  | (5,613)
Other current and non-current liabilities |  |  | 18,833
Restatement Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Change in fair value of derivative instruments |  |  | (580)
Other current and non-current assets |  |  | 3,017
Other current and non-current liabilities |  |  | $ (2,437)
[1] | Following the adoption of the amendments to ASC 230, the statement of cash flows presents the change in the period in total cash, cash equivalents and restricted cash. These amendments have been applied retrospectively for the nine months ended September 30, 2017.

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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