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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	$ 1,040	$ 5,821	$ 2,079	$ 11,894
Interest cost	11,098	10,291	22,196	20,637
Expected return on plan assets	(12,700)	(11,815)	(25,401)	(23,574)
Curtailment (gain) loss	0	855	0	855
Amortization of prior service cost (credit)	47	85	94	180
Amortization of actuarial loss	2,805	5,575	5,610	11,995
Net periodic pension benefit cost	2,290	10,812	4,578	21,987
Pretax reclassification from AOCI included in net periodic postretirement benefit cost	2,852	6,515	5,704	13,030
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost
Service cost	537	707	1,073	1,415
Interest cost	825	815	1,649	1,630
Curtailment (gain) loss	0	0	(3,832)	0
Amortization of prior service cost (credit)	(1,082)	(1,216)	(2,164)	(2,432)
Amortization of actuarial loss	56	343	113	686
Net periodic pension benefit cost	336	649	(3,161)	1,299
Pretax reclassification from AOCI included in net periodic postretirement benefit cost	$ (1,026)	$ (873)	$ (5,883)	$ (1,746)