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Common Stock And Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Common stock, shares outstanding 514,755,845     506,891,874
Dividend per share $ 1.55 $ 0.53 $ 0.49  
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 $ 12,632,000     $ 12,198,000
Equity Contract [Member]        
Equity distribution agreement amount $ 246,300      
Common stock shares issued 440,632      
Fees and Commissions $ 243      
Common stock 28,400      
Equity Distribution Agreement Total Contract $ 275,000      
Underwritten Public Offering [Member]        
Sale of common stock in an underwritten public offering 0      
Common stock issued, amount $ 0      
Four Zero One K Plan D R S P P Shared Based Compensation Plans [Member]        
Common stock shares issued 7,419,412      
Common stock $ 366,400      
Utility [Member]        
Net restricted assets for revolving credit facility ratio requirement 14,300,000      
Restricted reinvested earnings $ 218,000