DISCONTINUED OPERATIONS (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013 Natural Gas Storage	Dec. 31, 2013 Natural Gas Storage	Dec. 31, 2012 Natural Gas Storage	Dec. 31, 2011 Natural Gas Storage
Discontinued operations
Asset impairment charge	$ 169,000,000	$ 60,000,000	$ 59,950,000	$ 169,000,000	$ 169,000,000
Non-cash goodwill impairment charge							169,600,000
Results from discontinued operations
Revenue					55,757,000	71,339,000	65,990,000
Depreciation and amortization					7,608,000	7,567,000	7,136,000
Loss from discontinued operations					(187,174,000)	(5,328,000)	(177,163,000)
Assets held for sale
Property, plant and equipment, net	157,261,000
Other current assets	24,443,000
Other non-current assets	4,000
Assets held for sale	181,708,000
Liabilities held for sale
Accounts payable	2,182,000
Accrued liabilities and other current liabilities	8,947,000
Other non-current liabilities	26,638,000
Liabilities held for sale	$ 37,767,000