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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2012
Stockholders' Equity (Tables) [Abstract]  
Summary of stockholder's equity capital accounts
  March 31, 2012 December 31, 2011
Preferred Stock:    
Authorized shares  50,000,000  50,000,000
Issued shares  37,224,854  25,724,854
Outstanding shares  37,224,854  25,724,854
     
Common Stock, $1.00 par value:    
Authorized shares  400,000,000  400,000,000
Issued shares  214,078,223  192,604,918
Outstanding shares  213,682,073  192,275,248
Summary of common stock issuances
  Shares Issued  Average Price  Gross Proceeds  Net Proceeds
            
March 2011 public issuance  28,750,000 $ 49.25 $ 1,415,938 $ 1,358,694
2011 Dividend reinvestment plan issuances  574,652   48.42   27,822   27,822
2011 Option exercises  37,922   42.24   1,602   1,602
2011 Totals  29,362,574    $ 1,445,362 $ 1,388,118
            
Febraury 2012 public issuance  20,700,000 $ 53.50 $ 1,107,450 $ 1,062,737
2012 Dividend reinvestment plan issuances  429,058   54.61   23,429   23,429
2012 Option exercises  43,047   37.42   1,611   1,611
2012 Totals  21,172,105    $ 1,132,490 $ 1,087,777
Summary of accumulated other comprehensive income/(loss)
   March 31, 2012  December 31, 2011
Unrecognized losses on cash flow hedges $ (8,283) $ (8,561)
Unrecognized losses on equity investments   (612)   (619)
Unrecognized actuarial losses   (2,747)   (2,748)
Totals $ (11,642) $ (11,928)
Summary of comprehensive income/(loss)
  Three Months Ended
  March 31,
  2012 2011
Unrecognized gains on cash flow hedges$ 278 $ 482
Unrecognized gains on equity investments  8   322
 Total other comprehensive income (loss)  286   804
Net income attributable to controlling interests  58,514   32,052
 Comprehensive income (loss) attributable to controlling interests  58,800   32,856
Net and comprehensive income (loss) attributable to noncontrolling interests(1)  (1,056)   (242)
 Total comprehensive income (loss) attributable to common stockholders$ 57,744 $ 32,614
      
       
(1) Includes amounts attributable to redeemable noncontrolling interests.