BENEFIT PLANS (Components of Net Periodic Benefit Cost, Amounts Recognized in Other Comprehensive Income, Weighted-Average Assumptions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	$ 1,039	$ 4,958	$ 3,118	$ 16,852
Interest cost	11,098	10,179	33,294	30,816
Expected return on plan assets	(12,701)	(11,926)	(38,102)	(35,500)
Curtailment (gain) loss	0	0	0	855
Amortization of prior service cost (credit)	47	79	141	259
Amortization of actuarial loss	2,806	4,264	8,416	16,259
Net periodic pension benefit cost	2,289	7,554	6,867	29,541
Pretax reclassification from AOCI included in net periodic postretirement benefit cost	2,853	4,343	8,557	17,373
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	536	708	1,609	2,123
Interest cost	824	815	2,473	2,445
Curtailment (gain) loss	0	0	(3,832)	0
Amortization of prior service cost (credit)	(1,081)	(1,215)	(3,245)	(3,647)
Amortization of actuarial loss	57	343	170	1,029
Net periodic pension benefit cost	336	651	(2,825)	1,950
Pretax reclassification from AOCI included in net periodic postretirement benefit cost	$ (1,024)	$ (872)	$ (6,907)	$ (2,618)