INCOME TAXES (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Federal Income Tax Expense at Statutory Rate		$ 22,000,000	$ 36,000,000	$ 49,000,000	$ 48,000,000
State Income Tax Expense, Net of Federal Deduction		3,000,000	5,000,000	6,000,000	6,000,000
Federal/State Tax Credits		(2,000,000)	(1,000,000)	(4,000,000)	(2,000,000)
Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset	(11,000,000)			0	(11,000,000)
Other		1,000,000	(1,000,000)	1,000,000	1,000,000
Income Tax Expense		$ 23,576,000	$ 38,828,000	$ 51,656,000	$ 41,737,000