BUSINESS ORGANIZATION AND STATEMENT OF ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Philadelphia Gas Works [Member]	Mar. 02, 2014 Philadelphia Gas Works [Member]	Sep. 30, 2014 Philadelphia Gas Works [Member] Bridge Facility [Member]	Sep. 30, 2014 Philadelphia Gas Works [Member] Operating Expense [Member]	Sep. 30, 2014 Milford LNG [Member] gal
Ownership percentage in GenConn [Abstract]
Ownership percentage in joint venture (in hundredths)	50.00%		50.00%
Business Acquisition [Line Items]
Initial purchase price						$ 1,860,000,000
Acquisition related expenses	570,000	0	6,090,000	0	21,300,000		15,200,000	6,100,000
Capacity of storage tank acquired									14,600,000
Inventory acquired for cash purchase price			$ 20,110,000	$ 0					$ 20,110,000