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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
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