PENSION AND OTHER POSTRETIREMENT BENEFITS 2 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Regulatory Assets
Beginning Balance	$ 68,713	$ 61,811
Amounts Arising During the Period, Net Actuarial Gain (Loss)	(20,554)	11,599
Amounts Amortized to Net Periodic Costs, Net Actuarial Loss	(5,319)	(4,490)
Amounts Amortized to Net Periodic Costs, Prior Service (Cost) Credit	(208)	(207)
Ending Balance	42,632	68,713
Accumulated Other Comprehensive Loss (pre-tax)
Beginning Balance	21,908	19,061
Amounts Arising During the Period, Net Actuarial Gain (Loss)	(1,576)	4,788
Amounts Amortized to Net Periodic Costs, Net Actuarial Loss	(2,289)	(1,941)
Amounts Amortized to Net Periodic Costs, Prior Service (Cost) Credit	0	0
Ending Balance	18,043	21,908
Other Postretirement Benefits [Member]
Regulatory Assets
Beginning Balance	27,184	26,435
Amounts Arising During the Period, Net Actuarial Gain (Loss)	(9,171)	2,089
Amounts Amortized to Net Periodic Costs, Net Actuarial Loss	(1,555)	(1,535)
Amounts Amortized to Net Periodic Costs, Prior Service (Cost) Credit	194	195
Ending Balance	16,652	27,184
Accumulated Other Comprehensive Loss (pre-tax)
Beginning Balance	0	0
Amounts Arising During the Period, Net Actuarial Gain (Loss)	0	0
Amounts Amortized to Net Periodic Costs, Net Actuarial Loss	0	0
Amounts Amortized to Net Periodic Costs, Prior Service (Cost) Credit	0	0
Ending Balance	$ 0	$ 0