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Reconciliation of Segment Information, Total Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Assets:      
Total Assets $ 9,063,769 $ 9,183,981 $ 10,715,874
Total Other Assets 461,013 417,403  
Items excluded from segment assets:      
Recoverable Income Taxes 124,555 $ 116,851  
Operating Segments [Member]      
Assets:      
Total Assets 8,029,471   8,893,127
Corporate and Other [Member]      
Assets:      
Total Other Assets 810,939   876,286
Gas Segment [Member]      
Assets:      
Total Assets 6,074,299   6,814,568
Other Segments [Member]      
Assets:      
Total Assets 1,029,724   1,295,011
Items excluded from segment assets:      
Cash and Other Investments 54,630    
Excludes Gas Segment [Member]      
Items excluded from segment assets:      
Cash and Other Investments     416,854
Intersegment Eliminations [Member]      
Assets:      
Total Assets 4,574   527,736
Items excluded from segment assets:      
Cash and Other Investments 124,555    
Recoverable Income Taxes     1,871
Deferred Tax Assets, Net of Valuation Allowance 44,174   0
Disposal Group, Including Discontinued Operation, Assets $ 0   $ 527,736