PENSION AND OTHER BENEFITS (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension contributions					$ 55,000,000
Pension Benefit [Member]
Components of net periodic benefit cost:
Service cost	3,696,000		3,008,000		11,088,000		9,024,000
Interest cost	9,988,000		10,368,000		29,964,000		31,104,000
Expected return on plan assets	(12,863,000)		(11,219,000)		(38,589,000)		(33,657,000)
Amortization of:
Prior service costs	151,000		162,000		453,000		486,000
Transition obligation	0		0		0		0
Actuarial loss	5,208,000		3,294,000		15,624,000		9,882,000
Settlements (1)	632,000	[1]	0	[1]	632,000	[1]	0	[1]
Net periodic benefit cost	6,812,000		5,613,000		19,172,000		16,839,000
Pension Benefit [Member] | Minimum [Member]
Actuarial weighted-average assumptions
Discount rate (in hundredths)	4.00%		5.05%		4.00%		5.05%
Average wage increase (in hundredths)	3.50%		3.50%		3.50%		3.50%
Return on plan assets (in hundredths)	7.75%		7.75%		7.75%		7.75%
Pension Benefit [Member] | Maximum [Member]
Actuarial weighted-average assumptions
Discount rate (in hundredths)	4.25%		5.30%		4.25%		5.30%
Average wage increase (in hundredths)	3.80%		3.80%		3.80%		3.80%
Return on plan assets (in hundredths)	8.00%		8.00%		8.00%		8.00%
Other Postretirement Benefits [Member]
Components of net periodic benefit cost:
Service cost	481,000		401,000		1,443,000		1,203,000
Interest cost	1,384,000		1,562,000		4,152,000		4,686,000
Expected return on plan assets	(648,000)		(626,000)		(1,944,000)		(1,878,000)
Amortization of:
Prior service costs	(13,000)		(17,000)		(39,000)		(51,000)
Transition obligation	0		98,000		0		294,000
Actuarial loss	444,000		241,000		1,332,000		723,000
Settlements (1)	0	[1]	0	[1]	0	[1]	0	[1]
Net periodic benefit cost	$ 1,648,000		$ 1,659,000		$ 4,944,000		$ 4,977,000
Actuarial weighted-average assumptions
Composite health care trend rate (current year) (in hundredths)	7.50%		8.00%		7.50%		8.00%
Composite health care trend rate (2018 forward) (in hundredths)	5.00%		5.00%		5.00%		5.00%
Other Postretirement Benefits [Member] | Minimum [Member]
Actuarial weighted-average assumptions
Discount rate (in hundredths)	4.00%		5.05%		4.00%		5.05%
Return on plan assets (in hundredths)	5.56%		5.56%		5.56%		5.56%
Other Postretirement Benefits [Member] | Maximum [Member]
Actuarial weighted-average assumptions
Discount rate (in hundredths)	4.25%		5.30%		4.25%		5.30%
Return on plan assets (in hundredths)	8.00%		8.00%		8.00%		8.00%

[1] Reflects settlement charges resulting from a distribution to a former employee upon retirement