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Stock Option and Incentive Plan (Restricted Stock) (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued 153,171,474   153,171,474   153,062,001
Stock based Compensation Expense $ 6,200,000 $ 6,400,000 $ 16,000,000 $ 31,900,000  
Common Stock, Value, Issued 1,531,000   1,531,000   1,530,000
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued 23,968   23,968    
Employee and director payment per share (in dollars per share)     $ 0.01    
Common Stock, Value, Issued 2,600,000   2,600,000    
Employee's weighted average cost per share (in dollars per share) $ 109.27   $ 109.27    
LTIP Units [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
LTIP units issued (in shares) 127,094   127,094    
Value of LTIP units issued     12,800,000    
Per unit fair value weighted-average (in dollars per share) $ 100.61   $ 100.61    
Expected life assumed to calculate per unit fair value per LTIP unit (years)     5 years 8 months 12 days    
Risk-free rate     1.84%    
Expected price volatility     27.00%    
OPP Units 2011 [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated compensation expenses related To 2011 OPP Units     1,200,000    
MYLTIP [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
MYLTIP units issued (in shares) 485,459   485,459    
LTIPs And Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting annual installments     4    
Unrecognized compensation expenses 22,300,000   22,300,000    
LTIPs and OPP Awards [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee and director payment per share (in dollars per share)     $ 0.25    
Unvested 2012 OPP Units and 2013 and 2014 MYLTIPS [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expenses 18,600,000   18,600,000    
Weighted-average period (years) 3 years 1 month 6 days        
Board of Directors Chairman [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based Compensation Expense   $ 1,600,000   $ 18,600,000