BUSINESS ORGANIZATION AND STATEMENT OF ACCOUNTING POLICIES, EQUITY INVESTMENTS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Equity Investments [Abstract]
Carrying value of joint venture	$ 114,305,000		$ 114,305,000		$ 118,241,000
Income (loss) from equity investment	3,492,000	3,930,000	10,398,000	11,590,000
GenConn [Member]
Equity Investments [Abstract]
Number of peaking generation plants	2		2
Carrying value of joint venture	114,300,000		114,300,000		118,200,000
Undistributed earnings in equity method investment	100,000		100,000
Income (loss) from equity investment	3,500,000	3,900,000	10,400,000	11,600,000
Distributions received from joint venture	$ 5,500,000	$ 0	$ 14,300,000	$ 9,800,000