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Other Financial Items (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Other Income and Expenses [Abstract]    
Unrealized (mark-to-market) (losses)/gains for interest rate swaps $ (23,649) $ 51,478
Interest expense on undesignated interest rate swaps (10,031) (5,101)
Others (5,056) (1,256)
Other financial items, net $ (38,736) $ 45,121