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DISCONTINUED OPERATIONS AND AFFILIATIONS 2 (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
mi
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
mi
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Affiliations [Abstract]          
Investments in unconsolidated affiliates     $ 4,400 $ 1,300  
Notes Receivable - affiliate $ 49,800   49,800   $ 51,500
Due from Affiliate, Noncurrent, Secured By Property, Plant, And Equipment $ 38,900   $ 38,900    
Interest accrual on secured notes receivable 7.50%   7.50%    
Due from Affiliate, Noncurrent, Unsecured $ 10,900   $ 10,900    
Net asset - included in investment in affiliates and other noncurrent liabilities $ 52,400   52,400    
Combined equity contributions and the notes receivable - affiliate     $ 103,000    
Energenic US LLC          
Affiliations [Abstract]          
Equity interest 50.00%   50.00%    
Equity Method Investment, Summarized Financial Information [Abstract]          
Revenues $ 18,183 $ 27,160 $ 63,812 83,380  
Cost of sales 5,048 5,390 16,452 20,588  
Loss from continuing operations (4,984) (4,154) (42,367) (4,139)  
Net Loss $ (4,984) $ (4,154) $ (42,367) $ (4,139)  
Potato Creek, LLC (Potato Creek)          
Affiliations [Abstract]          
Equity interest 30.00%   30.00%    
PennEast Pipeline Company, LLC (PennEast)          
Affiliations [Abstract]          
Equity interest 20.00%   20.00%    
Length of Pipeline (in miles) | mi 100   100