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
	Mar. 31, 2014	Mar. 31, 2013
Pension Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	$ 1,039	$ 6,070
Interest cost	11,098	10,346
Expected return on plan assets	(12,701)	(11,759)
Amortization of prior service cost (credit)	47	95
Amortization of actuarial loss	2,805	6,420
Net periodic pension benefit cost	2,288	11,172
Pretax reclassification from AOCI included in net periodic postretirement benefit cost	2,852	6,515
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	536	708
Interest cost	824	815
Curtailment gain	(3,832)	0
Amortization of prior service cost (credit)	(1,082)	(1,216)
Amortization of actuarial loss	57	343
Net periodic pension benefit cost	(3,497)	650
Pretax reclassification from AOCI included in net periodic postretirement benefit cost	$ (4,857)	$ (873)