XML 135 R99.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Share-based Compensation - Additional Information (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2014
shares
Dec. 31, 2019
USD ($)
unit / shares
fungible_unit
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
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       $ 2,100,000 $ 6,300,000 $ 7,200,000  
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)       0 days 3 years 6 months 4 years 4 months 24 days  
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 8 months 12 days      
Remaining weighted average contractual life of the options exercisable (in years)       2 years 8 months 12 days      
Total unrecognized compensation cost related to unvested stock awards       $ 100,000      
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)       2 months 12 days      
Weighted average fair value of options granted during the period       $ 0 $ 84,068 $ 3,816,652  
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       $ 12,892,249 12,757,704 9,809,749  
Total unrecognized compensation cost related to unvested stock awards       $ 20,800,000      
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)       2 years      
Fair value of restricted stock vested during the period       $ 12,100,000 9,800,000 9,400,000  
Weighted average fair value of options granted during the period       $ 11,131,181 $ 13,440,503 $ 9,905,986  
Awards granted (in shares) | shares       126,350 162,900 96,185  
Awards outstanding (in shares) | shares       3,566,466 3,452,016 3,298,216 3,202,031
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)       2 years 3 months 18 days      
Weighted average fair value of options granted during the period       $ 58,300,000 $ 22,000,000.0    
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation cost related to unvested stock awards       31,200,000      
Share-based Payment Arrangement, Noncash Expense       $ 22,200,000 24,400,000 $ 26,100,000  
Employee Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for issuance (shares) | shares       500,000      
Shares of common stock available for issuance (shares)       85.00%      
Duration of each offering period starting the first day of each calendar quarter (in months)       3 months      
Shares of common stock issued (shares) | shares       131,440      
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) | fungible_unit       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 | fungible_unit       4,100,000      
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       $ 2,500,000 $ 5,400,000 7,800,000  
2014 Outperformance Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense       0   $ 13,600,000  
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options       27,900,000      
Maximum award to be earned, if performance reaches maximum threshold, first performance period     0.333        
Maximum award to be earned, if performance reaches maximum threshold, first performance period     0.667        
Award period (in years)     3 years        
Awards granted (in shares) | shares     610,000        
2014 Outperformance Plan | Vesting on August 31, 2017              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of units vested   50.00%          
2014 Outperformance Plan | Vesting on August 31, 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of units vested 50.00%            
Deferred Stock Compensation Plan for Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense       $ 2,400,000      
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       18,669      
Shares issued (in shares) | shares       9,949      
Awards outstanding (in shares) | shares       128,946