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Share-based Compensation - Additional Information (Details)
$ / shares in Units, fungible_unit in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
unit / shares
unit
fungible_unit
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
unit / shares
unit
fungible_unit
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
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 $ 1,600,000 $ 1,400,000 $ 4,700,000      
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        
Exercise price of options granted, low end of the range (in dollars per share) | $ / shares     $ 20.67        
Exercise price of options granted, high end of the range (in dollars per share) | $ / shares     $ 137.18        
Remaining weighted average contractual life of the options outstanding (in years)     2 years 9 months 18 days        
Remaining average contractual life of the options exercisable (in years)     2 years 9 months 18 days        
Total unrecognized compensation cost related to unvested stock awards $ 700,000   $ 700,000        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)     3 months 18 days        
Weighted average fair value of options granted during the period     $ 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        
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     $ 9,469,622 12,757,704      
Total unrecognized compensation cost related to unvested stock awards $ 15,100,000   $ 15,100,000        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)     1 year 9 months 18 days        
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     $ 12,000,000.0     $ 9,800,000  
Weighted average fair value of options granted during the period     $ 2,233,548 $ 13,440,503      
Awards granted (in shares) | shares     27,650 162,900      
Awards outstanding (in shares) | shares 3,468,166   3,468,166   3,452,016 3,298,216  
LTIP units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average fair value of options granted during the period     $ 41,600,000   $ 22,000,000.0    
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense $ 3,000,000.0 2,300,000 14,000,000.0 $ 11,400,000      
Total unrecognized compensation cost related to unvested stock awards $ 22,500,000   $ 22,500,000        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)     2 years 3 months 18 days        
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 | fungible_unit 4.9   4.9        
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 $ 600,000 1,100,000 $ 1,800,000 4,300,000      
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   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        
Award expiration period (in years)     10 years        
Deferred Stock Compensation Plan for Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense $ 200,000 $ 100,000 $ 2,200,000 $ 2,200,000      
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     17,227        
Shares issued (in shares) | shares     9,869        
Awards outstanding (in shares) | shares 127,505   127,505        
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 127,280   127,280