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Summary of Significant Accounting Policies Other (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Regency Gas Services, LLC [Member]
Dec. 31, 2012
Regency Gas Services, LLC [Member]
Dec. 31, 2011
Regency Gas Services, LLC [Member]
Dec. 31, 2013
Anadarko Petroleum Company [Member]
Dec. 31, 2013
Plains Marketing, LP [Member]
Dec. 31, 2012
Plains Marketing, LP [Member]
Dec. 31, 2012
Convertible Debt [Member]
Dec. 31, 2013
Convertible Debt [Member]
Dec. 31, 2010
Convertible Debt [Member]
Dec. 31, 2013
Line of Credit [Member]
Dec. 31, 2012
Line of Credit [Member]
Basis of Presentation and Significant Accounting Policies [Line Items]                            
Revolving credit facility $ 0 $ 340,000,000                     $ 0 $ 340,000,000
Concentration of Credit Risk and Major Customers [Abstract]                            
Number of Major Customers 3 2 1                      
Entity-Wide Revenue, Major Customer, Percentage       26.00% 21.00% 18.00% 16.00% 12.00% 13.00%          
Number of Counterparties Downgraded 3                          
Number of Derivative Counterparties 10                          
Property, Plant and Equipment [Abstract]                            
Property, Plant, and Equipment, Salvage Value 57,500,000 64,400,000                        
Inventory, Net [Abstract]                            
Raw Materials Inventory 16,000,000 13,400,000                        
Property, Plant and Equipment, Estimated Useful Lives three to thirty years                          
Goodwill and Intangible Assets Disclosure [Abstract]                            
Intangible Assets, Net (Excluding Goodwill) 10,800,000                          
Revenues [Abstract]                            
Revenue Receipt, Days After Sale, Low End of Range 30                          
Revenue Receipt, Days After Sale, High End of Range 90                          
Impairment of Proved Properties [Abstract]                            
Period of New York Mercantile Exchange Strip Pricing Used for Price Forecast 5                          
Impairment of proved properties 172,641,000 208,923,000 219,037,000                      
Abandonment and impairment of unproved properties 46,105,000 16,342,000 7,367,000                      
Debt Instruments [Abstract]                            
Debt Instrument, Interest Rate, Stated Percentage                   3.50% 3.50% 3.50%    
Debt Instrument, Convertible, Conversion Price                   $ 54.42        
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock                   1,000        
Debt instrument convertible conversion rate                   864,106        
Capitalization of Development and Implementation of Internal Use Software $ 11,200,000