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Equity - Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
May 10, 2017
Jul. 06, 2011
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Restricted stock              
Stock-based incentive plan awards              
Compensation expense, net of capitalization     $ 5.3 $ 4.6      
Restricted stock | Employees              
Stock-based incentive plan awards              
Vesting period     3 years        
Awards earned (in units)     69,269        
Weighted average fair value of shares granted during the period (in dollars per share)     $ 171.89        
Restricted stock | Non-employee Directors              
Stock-based incentive plan awards              
Vesting period 1 year            
Awards earned (in units) 7,864            
Weighted average fair value of shares granted during the period (in dollars per share) $ 165.65            
LTIP Retention Award to Chairman and CEO              
Stock-based incentive plan awards              
Awards earned (in units)   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)           360,000  
LTIP Retention Award to Chairman and CEO | A Units | Maximum              
Stock-based incentive plan awards              
Shares reserved for issuance (in shares)             360,000
LTIP Retention Award to Chairman and CEO | B Units              
Stock-based incentive plan awards              
Awards earned (in units)         360,000    
LTIP Retention Award to Chairman and CEO | B Units | Maximum              
Stock-based incentive plan awards              
Shares reserved for issuance (in shares)             360,000
LTIP Retention Award to Chairman and CEO | C Units | Maximum              
Stock-based incentive plan awards              
Shares reserved for issuance (in shares)             280,000
LTIP program              
Stock-based incentive plan awards              
Vesting period     2 years        
Vesting rights percentage     50.00%        
Percent of distributions of Operating Partnership that participants are entitled to receive during performance period     10.00%        
Compensation expense, net of capitalization     $ 5.1 $ 13.0      
1-year 2010 LTIP Program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     133,673        
Performance period     1 year        
Grant Date Fair Value     $ 7.2        
2-year 2010 LTIP Program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     337,006        
Performance period     2 years        
Grant Date Fair Value     $ 14.8        
3-year 2010 LTIP Program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     489,654        
Performance period     3 years        
Grant Date Fair Value     $ 23.0        
2011-2013 LTIP Program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     469,848        
Grant Date Fair Value     $ 35.0        
2012-2014 LTIP Program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     401,203        
Grant Date Fair Value     $ 35.0        
2013-2015 LTIP program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     466,405        
Grant Date Fair Value     $ 28.5        
2014-2016 LTIP program | LTIP Units              
Stock-based incentive plan awards              
LTIP Units Earned (in units)     120,314        
Grant Date Fair Value     $ 27.5        
2015-2017 LTIP program | LTIP Units              
Stock-based incentive plan awards              
Grant Date Fair Value     25.1        
2016-2018 LTIP program | LTIP Units              
Stock-based incentive plan awards              
Grant Date Fair Value     $ 26.3