OTHER COMPREHENSIVE INCOME (Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
OTHER COMPREHENSIVE INCOME [Abstract]
Cash flow hedges	$ (13,592)	$ (14,494)	$ (14,715)
Pension and postretirement plans	(105,514)	(105,575)	(132,131)
Total	$ (119,106)	$ (120,069)	$ (146,846)