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Significant Accounting Policies (Other Policies Textuals) (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Other Assets, Noncurrent [Abstract]      
Goodwill $ 3,821,600,000 $ 401,700,000 $ 401,700,000
Gas Balancing Payable, Current 2,200,000    
Gas Balancing Asset (Liability) $ 2,300,000