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Share and Unit-Based Plans - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2019
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capitalized share and unit-based compensation costs   $ 1,459 $ 1,904 $ 2,605 $ 4,513
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   3,555   $ 3,555  
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   6,407   $ 6,407  
Market-indexed          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Risk free interest rate 2.46%        
Volatility 23.52%        
Phantom stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost of share and unit-based plans   $ 482   $ 482