XML 66 R46.htm IDEA: XBRL DOCUMENT v3.20.2
Equity - Stock Based Compensation (Details)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jul. 06, 2011
USD ($)
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Restricted stock              
Stock-based incentive plan awards              
Compensation expense, net of capitalization   $ 6.0 $ 3.8        
Restricted stock | Employees              
Stock-based incentive plan awards              
Shares awarded (in shares) | shares   135,140          
Weighted average fair value (in dollars per share) | $ / shares   $ 54.86          
Vesting service period   3 years          
Restricted stock | Non-employee Director              
Stock-based incentive plan awards              
Shares awarded (in shares) | shares   32,487          
Weighted average fair value (in dollars per share) | $ / shares   $ 58.57          
Vesting service period   1 year          
LTIP Retention Award to Chairman and CEO              
Stock-based incentive plan awards              
Awards earned (in units) | shares 1,000,000            
Grant Date Fair Value $ 120.3            
Service period 8 years            
LTIP Retention Award to Chairman and CEO | A Units              
Stock-based incentive plan awards              
Awards earned (in units) | shares             360,000
LTIP Retention Award to Chairman and CEO | B Units              
Stock-based incentive plan awards              
Awards earned (in units) | shares           360,000  
LTIP Retention Award to Chairman and CEO | C Units              
Stock-based incentive plan awards              
Awards earned (in units) | shares         280,000    
LTIP programs              
Stock-based incentive plan awards              
Percent of distributions of Operating Partnership that participants are entitled to receive during performance period   10.00%          
Compensation expense, net of capitalization   $ 6.9 $ 8.1        
2018 LTIP program | LTIP Units              
Stock-based incentive plan awards              
Number of tranches | item       2      
Grant Date Fair Value       $ 12.1      
2018 LTIP program | LTIP Units | Maximum              
Stock-based incentive plan awards              
Grant Date Fair Value       $ 18.2      
2018 LTIP program | LTIP Units | Tranche A              
Stock-based incentive plan awards              
Vesting rights each year beginning 2021 (as a percent)       50.00%      
Performance period       2 years      
Awards earned (in units) | shares   38,148          
Grant Date Fair Value   $ 6.1   $ 6.1      
Grant Date Target Value   6.1          
2018 LTIP program | LTIP Units | Tranche B              
Stock-based incentive plan awards              
Performance period       3 years      
Grant Date Fair Value   6.1   $ 6.1      
Grant Date Target Value   $ 6.1          
2019 LTIP program | LTIP Units              
Stock-based incentive plan awards              
Performance period   3 years          
Grant Date Fair Value   $ 9.5          
Grant Date Target Value   14.7          
2019 LTIP program | LTIP Units | Maximum              
Stock-based incentive plan awards              
Grant Date Target Value   $ 22.1