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Share-based Compensation - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
unit / shares
fungibleUnit
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options $ 2,200,000 $ 2,100,000 $ 6,300,000  
Stock options, stock appreciation rights and other awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life of option (in years) 5 years      
All other awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fungible units per share (in fungible units per share) | unit / shares 1.0      
Expected life of option (in years) 10 years      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life of option (in years)     3 years 6 months  
Period of commencement of option vesting, from date of grant (in years) 1 year      
Remaining weighted average contractual life of the options outstanding (in years) 2 years 2 months 12 days      
Remaining weighted average contractual life of the options exercisable (in years) 2 years 2 months 12 days      
Total unrecognized compensation cost related to unvested stock awards $ 0      
Weighted average fair value of options granted during the period $ 0 0 $ 84,068  
Stock options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period (in years) 5 years      
Options vesting period (in years) 1 year      
Stock options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period (in years) 10 years      
Options vesting period (in years) 5 years      
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual award vesting rate, low end of range (as a percent) 15.00%      
Annual award vesting rate, high end of range (as a percent) 35.00%      
Class O LTIP Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred unit distributions as a percentage of common unit distributions 10.00%      
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 10,895,459 12,892,249 12,757,704  
Total unrecognized compensation cost related to unvested stock awards $ 7,900,000      
Weighted average period for recognition of compensation cost related to unvested stock awards (in years) 1 year 4 months 24 days      
Fair value of restricted stock vested during the period $ 12,500,000 12,100,000 9,800,000  
Weighted average fair value of options granted during the period $ 734,315 $ 11,131,181 $ 13,440,503  
Awards granted (in shares) | shares 8,959 122,768 158,281  
Awards outstanding (in shares) | shares 3,439,674 3,465,347 3,354,142 3,204,703
LTIP units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years) 1 year 9 months 18 days      
Weighted average fair value of options granted during the period $ 37,000,000.0 $ 58,300,000    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost related to unvested stock awards 36,000,000.0      
Share-based compensation $ 29,400,000 22,200,000 $ 24,400,000  
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance (shares) | shares 500,000      
Duration of each offering period starting the first day of each calendar quarter (in months) 3 months      
Shares of common stock available for issuance (shares) 85.00%      
Shares of common stock issued (shares) | shares 156,780      
Fourth Amended and Restated 2003 Stock Option and Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum fungible units that may be granted (in shares) | fungibleUnit 27,030,000      
Fungible units per share (in fungible units per share) | unit / shares 3.74      
Shares that may be issued if equal to fungible units (shares) (less than) | shares 27,030,000      
Fungible units | fungibleUnit 3,100,000      
Stock options, stock appreciation rights and other awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fungible units per share (in fungible units per share) | unit / shares 0.73      
Third Amendment and Restated 2005 Stock Option and Incentive Plan | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 0.0 $ 2,500,000 $ 5,400,000  
Deferred Stock Compensation Plan for Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 2,300,000      
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent) 100.00%      
Awards granted (in shares) | shares 20,753      
Shares issued (in shares) | shares 8,417      
Awards outstanding (in shares) | shares 140,775