BENEFIT PLANS (Components of Net Periodic Benefit Cost, Amounts Recognized in Other Comprehensive Income, Weighted-Average Assumptions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Net Periodic Benefit Cost
Service cost	$ 21,904	$ 22,349
Interest cost	40,995	43,194
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Healthcare cost trend rate assumed for next year	7.50%
Rate to which the cost trend rate gradually declines	5.00%
Year that the rate reaches the rate it is assumed to maintain	2019
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31
Expected return on plan assets	7.50%
Pension Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	21,904	22,349	20,762
Interest cost	40,995	43,194	42,383
Expected return on plan assets	(47,425)	(48,780)	(49,480)
Curtailment loss	855	0	0
Amortization of prior service cost	339	274	340
Amortization of actuarial loss	20,429	19,526	11,670
Net periodic pension benefit cost	37,097	36,563	25,675
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial loss (gain)	(163,205)	63,981	90,886
Prior service cost (credit)	(583)	1,286	0
Reclassification of acturial loss to net periodic pension benefit cost	(20,429)	(19,526)	(11,670)
Reclassification of prior service cost to net periodic pension benefit cost	(1,194)	(274)	(340)
Amount recognized in other comprehensive income	(185,411)	45,467	78,876
Amount recognized in net periodic pension benefit cost and other comprehensive income	(148,314)	82,030	104,551
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31
Discount rate	4.33%	4.96%	5.49%
Expected return on plan assets	7.50%	8.00%	8.00%
Rate of compensation increase (for salary-related plans)	3.50%	3.50%	3.50%
Weighted-average assumptions used to determine benefit obligation at December 31
Discount rate	4.91%	4.19%	4.96%
Rate of compensation increase (for salary-related plans)	3.50%	3.50%	3.50%
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	2,830	4,409	4,789
Interest cost	3,260	5,851	6,450
Amortization of prior service cost	(4,863)	(1,372)	(674)
Amortization of actuarial loss	1,372	1,346	1,149
Net periodic pension benefit cost	2,599	10,234	11,714
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial loss (gain)	(20,444)	13,562	(2,853)
Prior service cost (credit)	0	(38,414)	0
Reclassification of acturial loss to net periodic pension benefit cost	(1,372)	(1,346)	(1,149)
Reclassification of prior service cost to net periodic pension benefit cost	4,863	1,372	674
Amount recognized in other comprehensive income	(16,953)	(24,826)	(3,328)
Amount recognized in net periodic pension benefit cost and other comprehensive income	$ (14,354)	$ (14,592)	$ 8,386
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Healthcare cost trend rate assumed for next year	7.50%	8.00%	7.50%
Rate to which the cost trend rate gradually declines	5.00%	5.00%	5.00%
Year that the rate reaches the rate it is assumed to maintain	2019	2019	2017
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31
Discount rate	3.30%	4.60%	4.95%
Weighted-average assumptions used to determine benefit obligation at December 31
Discount rate	4.10%	3.30%	4.60%