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Equity - Stock Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 06, 2011
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Restricted stock            
Stock-based incentive plan awards            
Compensation expense, net of capitalization   $ 2.2 $ 2.4      
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   $ 4.6 $ 6.4      
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)   482,779        
Grant Date Fair Value   $ 29.5        
2014-2016 LTIP program | LTIP Units            
Stock-based incentive plan awards            
LTIP Units Earned (in units)   131,252        
Grant Date Fair Value   $ 30.0        
2015-2017 LTIP program | LTIP Units            
Stock-based incentive plan awards            
Grant Date Fair Value   27.4        
2016-2018 LTIP program | LTIP Units            
Stock-based incentive plan awards            
Grant Date Fair Value   $ 28.8