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Share and Unit-Based Plans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 29, 2018
Jan. 01, 2018
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Capitalized share and unit-based compensation costs     $ 1,062 $ 983 $ 5,575 $ 5,278
Stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Conversion rate of shares         1  
Unrecognized compensation cost of share and unit-based plans     3,023   $ 3,023  
LTIP Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Conversion rate of shares         1  
Unrecognized compensation cost of share and unit-based plans     6,882   $ 6,882  
LTIP Units | January 1, 2018            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Risk free rate   1.98%        
Volatility   23.38%        
LTIP Units | January 29, 2018            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Risk free rate 2.25%          
Volatility 23.86%          
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost of share and unit-based plans     83   83  
Phantom stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost of share and unit-based plans     $ 40   $ 40