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OTHER FINANCIAL ITEMS, NET OTHER FINANCIAL ITEMS, NET (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Other Financial Items [Abstract]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (9,568) $ (1,243) $ (13,051)
Derivative Instruments, Not Designated as Hedging Instruments, Net Cash Payments 2,641 2,833 6,453
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net (840) 59 (227)
Other Nonoperating Expense 669 556 1,558
Other Nonoperating Income (Expense) $ (13,718) $ (4,573) $ (21,289)