ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amount Reclassified from Accumulated Other Comprehensive Income
Changes in treasury locks									$ 20,514	$ 18,950	$ 17,300
Net (loss) / gain on derivatives									(3,233)	(2,996)	(5,722)
Total before tax									(264,383)	(241,373)	(274,942)
Tax benefit									92,457	78,953	91,312
Total reclassifications for the period	(36,899)	(45,264)	(49,802)	(40,029)	(34,990)	(42,127)	(41,686)	(43,809)	(171,994)	(162,612)	(183,683)
Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Total reclassifications for the period									4,409	3,178	2,020
Defined Benefit Pension Plans | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Amortization of net loss									6,519	4,329	2,488
Amortization of prior service cost									376	365	459
Total before tax									6,895	4,694	2,947
Tax benefit									(2,531)	(1,718)	(986)
Total reclassifications for the period									4,364	2,976	1,961
Other | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Total before tax									69	80	92
Tax benefit									(24)	122	(33)
Total reclassifications for the period									45	202	59
Other | Treasury locks | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Changes in treasury locks									69	90	87
Other | Foreign exchange contract | Amount Reclassified from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Net (loss) / gain on derivatives										$ (10)	$ 5