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Other Financial Items (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Others $ (1,199) $ (3,032) $ (1,057) $ (5,056)
Other financial items, net 50,802 (22,024) 18,851 (38,736)
Interest Rate Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized (mark-to-market) gains/ (losses) for derivatives 9,152 (13,585) (6,598) (23,649)
Interest expense on undesignated interest rate swaps (3,855) (5,407) (8,381) (10,031)
Equity Derivative        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized (mark-to-market) gains/ (losses) for derivatives $ 46,704 $ 0 $ 34,887 $ 0