OTHER COMPREHENSIVE INCOME (Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OTHER COMPREHENSIVE INCOME [Abstract]
Cash flow hedges	$ (13,300)	$ (14,494)	$ (20,322)
Pension and postretirement plans	(126,076)	(105,575)	(141,392)
Total	$ (139,376)	$ (120,069)	$ (161,714)	$ (99,631)