BENEFIT PLANS (Components of Net Periodic Benefit Cost, Amounts Recognized in Other Comprehensive Income, Weighted-Average Assumptions) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plans, Defined Benefit [Member]
Components of Net Periodic Benefit Cost
Service cost	$ 1,212	$ 1,040	$ 2,425	$ 2,079
Interest cost	11,036	11,098	22,073	22,196
Expected return on plan assets	(13,684)	(12,700)	(27,368)	(25,401)
Amortization of prior service cost (credit)	12	47	24	94
Amortization of actuarial loss	5,455	2,805	10,909	5,610
Net periodic pension/postretirement benefit cost	4,031	2,290	8,063	4,578
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Pretax reclassification from AOCI included in net periodic postretirement/pension benefit cost	5,467	2,852	10,933	5,704
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of Net Periodic Benefit Cost
Service cost	474	537	947	1,073
Interest cost	626	825	1,243	1,649
Curtailment gain	0	0	0	(3,832)
Amortization of prior service cost (credit)	(1,058)	(1,082)	(2,116)	(2,164)
Amortization of actuarial loss	23	56	19	113
Net periodic pension/postretirement benefit cost	65	336	93	(3,161)
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Pretax reclassification from AOCI included in net periodic postretirement/pension benefit cost	$ (1,035)	$ (1,026)	$ (2,097)	$ (5,883)