OTHER COMPREHENSIVE INCOME (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
OTHER COMPREHENSIVE INCOME [Abstract]
Cash flow hedges	$ (13,899)	$ (14,494)	$ (14,997)
Pension and postretirement plans	(105,535)	(105,575)	(136,014)
Total	$ (119,434)	$ (120,069)	$ (151,011)