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Income Taxes Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Contingency [Line Items]        
Effective tax rate     (2.70%) 33.60%
Effective tax rate, excluding impact of recently received IRS guidance     10.50%  
Income tax benefit $ (64,857) $ 59,089 $ (7,543) $ 175,424
Deferred Income Tax Charge        
Income Tax Contingency [Line Items]        
Amortization period for regulatory asset 32 years      
Equitable Gas Company, LLC        
Income Tax Contingency [Line Items]        
Income tax benefit $ 35,700   $ 35,700