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Share-based Compensation - Additional Information (Details)
fungibleUnit in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
unit / shares
unit
fungibleUnit
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
unit / shares
unit
fungibleUnit
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
shares
Jan. 01, 2008
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 $ 500,000 $ 600,000 $ 1,600,000 $ 1,700,000      
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Period of commencement of option vesting, from date of grant (in years)     1 year        
Options granted (in shares) | shares     0   0    
Remaining weighted average contractual life of the options outstanding (in years)     1 year 7 months 6 days        
Remaining average contractual life of the options exercisable (in years)     1 year 7 months 6 days        
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        
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%   10.00%        
Restricted Stock Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense     $ 6,339,292   $ 10,895,459    
Total unrecognized compensation cost related to unvested stock awards $ 9,100,000   $ 9,100,000        
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%        
Fair value of restricted stock vested during the period     $ 11,300,000   12,500,000    
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     $ 9,214,531   $ 734,315    
Awards granted (in shares) | shares     145,845   8,959    
Awards outstanding (in shares) | shares 3,566,283   3,566,283   3,439,674 3,465,347  
LTIP units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average fair value of options granted during the period     $ 45,100,000   $ 37,000,000    
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense $ 9,100,000 6,400,000 27,300,000 20,400,000      
Total unrecognized compensation cost related to unvested stock awards $ 51,200,000   $ 51,200,000        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)     1 year 8 months 12 days        
All other awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected term     10 years        
Third Amendment and Restated 2005 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) | unit 27,030,000   27,030,000        
Fungible units per share (in fungible units per share) | unit / shares 3.74   3.74        
Shares that may be issued if equal to fungible units (shares) (less than) | shares 27,030,000   27,030,000        
Fungible units | fungibleUnit 1.4   1.4        
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 $ 0 30,000.00      
Total unrecognized compensation cost related to unvested stock awards $ 0   $ 0        
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   0.73        
Award expiration period (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   1.0        
Deferred Stock Compensation Plan for Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense $ 100,000 $ 200,000 $ 2,200,000 $ 2,100,000      
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent) 100.00%   100.00%        
Awards granted (in shares) | shares     22,413        
Shares issued (in shares) | shares     12,226        
Awards outstanding (in shares) | shares 163,189   163,189        
Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for issuance (shares) | shares             500,000
Duration of each offering period starting the first day of each calendar quarter (in months)     3 months        
Discount from market price     85.00%        
Shares of common stock issued (shares) | shares 169,802   169,802