PENSION AND OTHER BENEFITS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Amortization of:
Pension contributions			$ 39,100,000
Number of years on which average of interest rate is based			2 years
Funding reduction for 2012			10,000,000
Total Expected contributions for 2012			50,000,000
Pension [Member]
Components of net periodic benefit cost:
Service cost	3,008,000	3,144,000	6,016,000	6,287,000
Interest cost	10,368,000	10,121,000	20,736,000	20,242,000
Expected return on plan assets	(11,219,000)	(10,647,000)	(22,438,000)	(21,294,000)
Amortization of:
Prior service costs	162,000	160,000	324,000	321,000
Transition obligation (asset)	0	0	0	0
Actuarial (gain) loss	3,294,000	3,509,000	6,588,000	7,016,000
Net periodic benefit cost	5,613,000	6,287,000	11,226,000	12,572,000
Discount rate, minimum (in hundredths)	5.05%	5.10%	5.05%	5.10%
Discount rate, maximum (in hundredths)	5.30%	5.35%	5.30%	5.35%
Average wage increase, minimum (in hundredths)	3.50%	3.50%	3.50%	3.50%
Average wage increase, maximum (in hundredths)	3.80%	3.80%	3.80%	3.80%
Return on plan assets, minimum (in hundredths)	7.75%	8.25%	7.75%	8.25%
Return on plan assets, maximum (in hundredths)	8.00%	8.50%	8.00%	8.50%
OPEB [Member]
Components of net periodic benefit cost:
Service cost	401,000	540,000	802,000	1,081,000
Interest cost	1,562,000	1,659,000	3,124,000	3,318,000
Expected return on plan assets	(626,000)	(741,000)	(1,252,000)	(1,482,000)
Amortization of:
Prior service costs	(17,000)	(26,000)	(34,000)	(51,000)
Transition obligation (asset)	98,000	255,000	196,000	510,000
Actuarial (gain) loss	241,000	502,000	482,000	1,004,000
Net periodic benefit cost	$ 1,659,000	$ 2,189,000	$ 3,318,000	$ 4,380,000
Discount rate, minimum (in hundredths)	5.05%	5.15%	5.05%	5.15%
Discount rate, maximum (in hundredths)	5.30%	5.30%	5.30%	5.30%
Return on plan assets, minimum (in hundredths)	5.56%	6.83%	5.56%	6.83%
Return on plan assets, maximum (in hundredths)	8.00%	8.25%	8.00%	8.25%
Composite health care trend rate (current year), minimum (in hundredths)		7.80%		7.80%
Composite health care trend rate (current year), maximum (in hundredths)	8.00%	8.50%	8.00%	8.50%
Composite health care trend rate (2018 forward), minimum (in hundredths)		4.50%		4.50%
Composite health care trend rate (2018 forward), maximum (in hundredths)	5.00%	5.00%	5.00%	5.00%
Pension plan beginning in 2012 [Member]
Amortization of:
Average interest rate used to estimate pension liabilities			10.00%
Preceding number of years for average interest rates			25 years
Pension plan beginning in 2016 [Member]
Amortization of:
Average interest rate used to estimate pension liabilities			30.00%
Preceding number of years for average interest rates			25 years