Share-Based Compensation - OP Units Grants (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restricted stock units | Associates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in shares)	6,581	1,195	303,191	284,666
Grant Date Fair Value (in thousands)	$ 252	$ 35	$ 10,137	$ 8,734
Restricted stock units | Trustees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in shares)	6,616	8,517	6,616	8,517
Vesting Period	1 year	1 year	1 year	1 year
Grant Date Fair Value (in thousands)	$ 250	$ 300	$ 250	$ 300
OP units | Associates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in shares)			258,479	255,720
Grant Date Fair Value (in thousands)			$ 8,434	$ 7,719
OP units | Trustees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in shares)	17,863	16,325	17,863	16,325
Vesting Period	1 year	1 year	1 year	1 year
Grant Date Fair Value (in thousands)	$ 675	$ 575	$ 675	$ 575
Minimum | Restricted stock units | Associates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	1 year	1 year	1 year	1 year
Minimum | OP units | Associates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period			1 year	1 year
Maximum | Restricted stock units | Associates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years		3 years	3 years
Maximum | OP units | Associates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period			3 years	3 years