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(Losses) gains on derivative instruments and other financial items, net (Losses) gains on derivative instruments (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
(Losses) gains on derivative instruments | $ (12,258) | $ 580
Interest Rate Swap |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
(Losses) gains on derivative instruments | 6,059 | 1,056
Earn-out Units |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
(Losses) gains on derivative instruments | (7,400) | 2,000
Equity Derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
(Losses) gains on derivative instruments | (10,757) | (3,841)
Foreign Exchange Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
(Losses) gains on derivative instruments | $ (160) | $ 1,365

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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