Commitments and Contingencies (Details) $ in Thousands		6 Months Ended
	Jun. 30, 2020 USD ($) property	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($)
Commitments and Contingencies [Line Items]
Amount of letters of credit outstanding	$ 291		$ 291
Number of properties with letters of credit | property	1		1
Aggregate proceeds, net			$ 11,369	$ 41,886
Circle East
Commitments and Contingencies [Line Items]
Redevelopment costs incurred	$ 23,438		23,438
Circle East | Minimum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	42,000		42,000
Circle East | Maximum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	44,000		44,000
One Loudoun Downtown - Pads G & H
Commitments and Contingencies [Line Items]
Redevelopment costs incurred	35,612		35,612
One Loudoun Downtown - Pads G & H | Minimum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	125,000		125,000
One Loudoun Downtown - Pads G & H | Maximum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	135,000		135,000
The Shoppes at Quarterfield
Commitments and Contingencies [Line Items]
Redevelopment costs incurred	1,155		1,155
The Shoppes at Quarterfield | Minimum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	9,000		9,000
The Shoppes at Quarterfield | Maximum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	10,000		10,000
Southlake Town Square - Pad
Commitments and Contingencies [Line Items]
Redevelopment costs incurred	432		432
Southlake Town Square - Pad | Minimum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	2,000		2,000
Southlake Town Square - Pad | Maximum
Commitments and Contingencies [Line Items]
Net estimated redevelopment costs	2,500		$ 2,500
Circle East, air rights
Commitments and Contingencies [Line Items]
Aggregate proceeds, net	$ 11,820
Forecast | Carillon
Commitments and Contingencies [Line Items]
Additional capital investment		$ 1,400