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Common Stock And Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Common stock, shares outstanding 506,891,874 492,025,443
Dividend per share $ 0.49 $ 0.445
Debt covenant ratio of total consolidated debt to total consolidated capitalization percentage 65.00%  
Percentage of equity for capital structure to be maintained 52.00%  
Common stock $ 12,198,000 $ 11,282,000
Equity Contract [Member]    
Equity distribution agreement amount $ 275,000  
Common stock shares issued 2,600,000  
Fees and Commissions $ 1,300  
Common stock $ 149,000  
Underwritten Public Offering [Member]    
Sale of common stock in an underwritten public offering 4,900,000  
Common stock issued, amount $ 309,000  
Four Zero One K Plan D R S P P Shared Based Compensation Plans [Member]    
Common stock shares issued 7,400,603  
Common stock $ 364,000  
Utility [Member]    
Net restricted assets for revolving credit facility ratio requirement 15,800,000  
Additional Common Stock Dividends $ 25,000