EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	Apr. 09, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Notes To Consolidated Financial Statements [Abstract]
Net Income Attributable to Controlling Interests		$ 171,021	$ 44,339	$ 399,110	$ 143,601
Basic		315,154,130	301,047,753	315,141,956	239,551,735
Weighted Average Number Diluted Shares Outstanding Adjustment		808,489	769,131	840,622	575,434
Diluted		315,962,619	301,816,884	315,982,578	240,127,169
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount		0	17,065	3,150	8,533
Basic Earnings Per Common Share		$ 0.54	$ 0.15	$ 1.27	$ 0.60
Diluted Earnings Per Common Share		$ 0.54	$ 0.15	$ 1.26	$ 0.60
Common Stock Issuance Merger With Nstar [Abstract]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	136,000,000