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OTHER COMPREHENSIVE INCOME (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
AOCI      
Cash flow hedges $ (14,997) $ (20,322) $ (21,609)
Pension and postretirement benefit plans (136,014) (141,392) (71,618)
Total $ (151,011) $ (161,714) $ (93,227)