Share Based Payments (Remaining unvested target units expected to vest) (Details)	Dec. 31, 2019 shares
2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	445,100
2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	84,018
2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	3,654
2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	531
LTIP Units [Member] | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	376,614
LTIP Units [Member] | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	64,587
LTIP Units [Member] | 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	0
LTIP Units [Member] | 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	0
Restricted Share Awards [Member] | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	68,486
Restricted Share Awards [Member] | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	19,431
Restricted Share Awards [Member] | 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	3,654
Restricted Share Awards [Member] | 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unvested target units, expected to vest	531