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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2012
Stockholders' Equity (Tables) [Abstract]  
Summary of stockholder's equity capital accounts

The following is a summary of our stockholder's equity capital accounts as of the dates indicated:

   December 31, 2012 December 31, 2011
Preferred Stock, $1.00 par value:    
 Authorized shares  50,000,000  50,000,000
 Issued shares  26,224,854  25,724,854
 Outstanding shares  26,224,854  25,724,854
      
Common Stock, $1.00 par value:    
 Authorized shares  400,000,000  400,000,000
 Issued shares  260,780,109  192,604,918
 Outstanding shares  260,373,754  192,275,248
Summary of preferred stock activity
  Year Ended
  December 31, 2012 December 31, 2011 December 31, 2010
    Weighted Avg.   Weighted Avg.   Weighted Avg.
  Shares Dividend Rate Shares Dividend Rate Shares Dividend Rate
             
Beginning balance  25,724,854 7.013%  11,349,854 7.663%  11,474,093 7.697%
Shares issued  11,500,000 6.500%  14,375,000 6.500%  349,854 6.000%
Shares redeemed  (11,000,000) 7.716%  - 0.000%  (5,513) 7.500%
Shares converted  - 0.000%  - 0.000%  (468,580) 7.262%
Ending balance  26,224,854 6.493%  25,724,854 7.013%  11,349,854 7.663%
             
Summary of common stock issuances

     Common Stock. The following is a summary of our common stock issuances during the periods indicated (dollars in thousands, except per share amounts):

  Shares Issued  Average Price  Gross Proceeds  Net Proceeds
            
September 2010 public issuance  9,200,000 $ 45.75 $ 420,900 $ 403,921
December 2010 public issuance  11,500,000   43.75   503,125   482,448
2010 Dividend reinvestment plan issuances  1,957,364   43.95   86,034   86,034
2010 Equity shelf program issuances  431,082   44.94   19,371   19,013
2010 Option exercises  129,054   31.17   4,022   4,022
2010 Totals  23,217,500    $ 1,033,452 $ 995,438
            
March 2011 public issuance  28,750,000 $ 49.25 $ 1,415,938 $ 1,358,543
November 2011 public issuance  12,650,000   50.00   632,500   606,595
2011 Dividend reinvestment plan issuances  2,534,707   48.44   122,794   121,846
2011 Equity shelf program issuances  848,620   50.53   42,888   41,982
2011 Option exercises  232,081   37.17   8,628   8,628
2011 Totals  45,015,408    $ 2,222,748 $ 2,137,594
            
February 2012 public issuance  20,700,000 $ 53.50 $ 1,107,450 $ 1,062,256
August 2012 public issuance  13,800,000   58.75   810,750   778,011
September 2012 public issuance  29,900,000   56.00   1,674,400   1,606,665
2012 Dividend reinvestment plan issuances  2,136,140   56.37   120,411   120,411
2012 Option exercises  341,371   40.86   13,949   13,949
2012 Senior note conversions  1,039,721      0   0
2012 Totals  67,917,232    $ 3,726,960 $ 3,581,292
Summary of dividend payments

The increase in dividends is primarily attributable to increases in our common and preferred shares outstanding as described above. Please refer to Notes 2 and 18 for information related to federal income tax of dividends. The following is a summary of our dividend payments (in thousands, except per share amounts)

  Year Ended
  December 31, 2012 December 31, 2011 December 31, 2010
  Per Share Amount Per Share Amount Per Share Amount
                   
Common Stock $ 2.96000 $ 653,321 $ 2.83500 $ 483,746 $ 2.74000 $ 348,578
Series D Preferred Stock   0.50301   2,012   1.96875   7,875   1.96875   7,875
Series E Preferred Stock   -   0   -   0   1.12500   94
Series F Preferred Stock   0.48715   3,410   1.90625   13,344   1.90625   13,344
Series G Preferred Stock   -   0   -   0   1.40640   332
Series H Preferred Stock   2.85840   1,000   2.85840   1,000   -   0
Series I Preferred Stock   3.25000   46,719   1.33159   38,283   -   0
Series J Preferred Stock   1.39038   15,988   -   0   -   0
Totals    $ 722,450    $ 544,248    $ 370,223
Summary of accumulated other comprehensive income/(loss)

The following is a summary of accumulated other comprehensive income/(loss) as of the dates indicated (in thousands):

   December 31, 2012  December 31, 2011
Unrecognized gains (losses) on cash flow hedges $ (6,957) $ (8,561)
Unrecognized gains (losses) on equity investments   (216)   (619)
Unrecognized gains (losses) on foreign currency translation   (881)   0
Unrecognized actuarial gains (losses)   (2,974)   (2,748)
Totals $ (11,028) $ (11,928)