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Share-based Compensation-Other (Details) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Aug. 31, 2011
Long Term Outperformance Compensation Program 2011 [Member]
Sep. 30, 2013
Long Term Outperformance Compensation Program 2011 [Member]
Sep. 30, 2012
Long Term Outperformance Compensation Program 2011 [Member]
Sep. 30, 2013
Long Term Outperformance Compensation Program 2011 [Member]
Sep. 30, 2012
Long Term Outperformance Compensation Program 2011 [Member]
Sep. 30, 2013
Deferred Stock Compensation Plan for Directors [Member]
Sep. 30, 2013
Employee Stock [Member]
Jan. 31, 2008
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Approximate amount of LTP units that may be earned by the recipients based on stock price appreciation         $ 85,000,000              
Term of long term compensation program         3 years              
Value of LTIP Units that could be earned expressed as percentage of outperformance amounts in excess of the 30% benchmark         10.00%              
Minimum return to be achieved for restricted stock awards to be made to plan participate (as a percent)         25.00%              
Award annual vesting (percent)               33.33%        
Maximum performance pool established, net of forfeitures         85,000,000              
Percentage of LTIP Units earned, vesting on August 31, 2014           50.00%   50.00%        
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Percentage of Awards Vesting on August 31, 2015           50.00%   50.00%        
Total compensation cost of plan subject to forfeitures               26,300,000        
Cost capitalized 900,000 900,000 2,900,000 2,900,000                
Compensation expense           $ 1,700,000 $ 1,400,000 $ 6,200,000 $ 4,000,000      
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee diretors                   100.00%    
Awards granted (in shares)                   6,692    
Phantom stock units outstanding (in shares)                   74,805    
Shares of common stock available for issuance                       500,000
Duration of each offering period starting the first day of each calendar quarter                     3 months  
Purchase price as a percentage of market value of the common stock                     85.00%  
Shares of common stock issued                     72,026