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OTHER COMPREHENSIVE INCOME (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OTHER COMPREHENSIVE INCOME [Abstract]        
Cash flow hedges $ (14,494) $ (20,322) $ (25,178)  
Pension and postretirement plans (105,575) (141,392) (74,453)  
Total $ (120,069) $ (161,714) $ (99,631) $ (225,517)