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REGULATORY PROCEEDINGS (Details) (USD $) In Millions	6 Months Ended		12 Months Ended
REGULATORY PROCEEDINGS (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010
REGULATORY PROCEEDINGS [Abstract]
Description of order issued	Bad debt rider
Net recovery related to 2008 and 2009 bad debt experience over benchmark		$ 31.7
Benchmark of the net bad debt rider recovery from customers			63.0	63.0
Bad debt experience				35.7
Amount of net bad debt rider (recovery from) refund to customers				$ 27.3

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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