DERIVATIVE FINANCIAL INSTRUMENTS (Details Textuals) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Jun. 30, 2012	Dec. 22, 1997	Sep. 30, 2014 Variable Interest Rate Swaps $125M	Oct. 31, 2011 Variable Interest Rate Swaps $125M	Sep. 30, 2014 Fixed Interest Rate Swaps $125M	Sep. 30, 2014 Interest Rate Swaps Designated As Fair Value Hedges	Dec. 31, 2013 Interest Rate Swaps Designated As Fair Value Hedges	Sep. 30, 2013 Interest Rate Swaps Designated As Fair Value Hedges
Derivative [Line Items]
Notional amount				$ 125.0		$ 125.0	$ 0	$ 0	$ 0
Amount of gain included in long-term debt				4.3	11.0
Cash flow hedges [Abstract]
Commodity forward contracts with Wells Fargo	55.7
Commodity forward contracts with Citibank	30.2
Cash Flow Hedges Derivative Instruments at Fair Value, Net	2.6
Approximate amount of deferred gains would be reclassified into earnings during the next twelve months	0.9
Fair value hedges [Abstract]
Amount of terminated interest rate swaps		73.1
Gain on terminated interest rate swaps	0.9	2.2
Series O Face Amount			97.5
Series G Face Amount			$ 97.5
Interest Rate on SunBelt Notes			7.23%