Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands				12 Months Ended
	Jul. 27, 2018	May 31, 2018	Jan. 22, 2018	Dec. 31, 2018	Aug. 28, 2018	Dec. 31, 2017	Nov. 01, 2017	Sep. 01, 2017	Aug. 09, 2017
Debt Instrument [Line Items]
Total principal balances				$ 700,722		$ 523,412
Unamortized fair value adjustments				(1,173)		(1,211)
Unamortized debt issuance costs				(5,310)		(4,929)
Indebtedness, net				$ 694,239		$ 517,272
LIBOR | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.40%
LIBOR | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				2.00%
LIBOR | Term Loan Without Related Interest Rate Swap Agreemen | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.35%
LIBOR | Term Loan Without Related Interest Rate Swap Agreemen | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.95%
LIBOR | Term Loan With Related Interest Rate Swap | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.35%
LIBOR | Term Loan With Related Interest Rate Swap | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.95%
Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		1.60%
Hanbury Village
Debt Instrument [Line Items]
Stated interest rate									3.78%
Sandbridge Commons | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.75%
Lightfoot Marketplace
Debt Instrument [Line Items]
Total principal balances							$ 10,500
Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate	1.25%
The Cosmopolitan
Debt Instrument [Line Items]
Stated interest rate						3.75%		3.35%
Secured Debt
Debt Instrument [Line Items]
Total principal balances				$ 394,722		$ 307,412
Secured Debt | Columbus Village | Notes 1
Debt Instrument [Line Items]
Total principal balances				$ 0		6,080
Secured Debt | Columbus Village | Notes 1 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				2.00%
Secured Debt | Columbus Village | Notes 2
Debt Instrument [Line Items]
Total principal balances				$ 0		2,218
Secured Debt | Columbus Village | Notes 2 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				2.00%
Secured Debt | North Point Center | Notes 1
Debt Instrument [Line Items]
Total principal balances				$ 9,352		9,571
Stated interest rate				6.45%
Secured Debt | North Point Center | Notes 2
Debt Instrument [Line Items]
Total principal balances				$ 2,346		2,459
Stated interest rate				7.25%
Secured Debt | Greenside (Harding Place)
Debt Instrument [Line Items]
Total principal balances				$ 25,902		3,874
Secured Debt | Greenside (Harding Place) | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				2.95%
Secured Debt | Premier (Town Center Phase VI)
Debt Instrument [Line Items]
Total principal balances				$ 19,214		1,505
Secured Debt | Premier (Town Center Phase VI) | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				3.50%
Secured Debt | Hoffler Place (King Street)
Debt Instrument [Line Items]
Total principal balances				$ 11,445		0
Secured Debt | Hoffler Place (King Street) | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				3.24%
Secured Debt | Summit Place (Meeting Street)
Debt Instrument [Line Items]
Total principal balances				$ 11,057		0
Secured Debt | Summit Place (Meeting Street) | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				3.24%
Secured Debt | Southgate Square
Debt Instrument [Line Items]
Total principal balances				$ 21,442		20,708
Secured Debt | Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.60%
Secured Debt | 4525 Main Street
Debt Instrument [Line Items]
Total principal balances				$ 32,034		32,034
Stated interest rate				3.25%
Secured Debt | Encore Apartments
Debt Instrument [Line Items]
Total principal balances				$ 24,966		24,966
Stated interest rate				3.25%
Secured Debt | Hanbury Village
Debt Instrument [Line Items]
Total principal balances				$ 19,019		19,503
Stated interest rate				3.782%
Secured Debt | Socastee Commons
Debt Instrument [Line Items]
Total principal balances				$ 4,671		4,771
Stated interest rate				4.57%
Secured Debt | Sandbridge Commons
Debt Instrument [Line Items]
Total principal balances				$ 8,258		8,468
Secured Debt | Sandbridge Commons | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.75%
Secured Debt | 249 Central Park Retail
Debt Instrument [Line Items]
Total principal balances				$ 17,045		16,851
Secured Debt | 249 Central Park Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.60%
Secured Debt | South Retail
Debt Instrument [Line Items]
Total principal balances				$ 7,483		7,394
Secured Debt | South Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.60%
Secured Debt | Fountain Plaza Retail
Debt Instrument [Line Items]
Total principal balances				$ 10,257		10,145
Secured Debt | Fountain Plaza Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.60%
Secured Debt | Lightfoot Marketplace
Debt Instrument [Line Items]
Total principal balances				$ 10,500		10,500
Secured Debt | Lightfoot Marketplace | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.75%
Secured Debt | Brooks Crossing Office
Debt Instrument [Line Items]
Total principal balances				$ 6,910		0
Secured Debt | Brooks Crossing Office | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.60%
Secured Debt | Market at Mill Creek
Debt Instrument [Line Items]
Total principal balances				$ 7,283		0
Secured Debt | Market at Mill Creek | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.55%
Secured Debt | Johns Hopkins Village
Debt Instrument [Line Items]
Total principal balances				$ 52,708		46,698
Secured Debt | Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.25%
Secured Debt | Lexington Square
Debt Instrument [Line Items]
Total principal balances				$ 14,940		0
Stated interest rate				4.50%	4.50%
Secured Debt | Smith’s Landing
Debt Instrument [Line Items]
Total principal balances				$ 18,985		19,764
Stated interest rate				4.05%
Secured Debt | Liberty Apartments
Debt Instrument [Line Items]
Total principal balances				$ 14,437		14,694
Stated interest rate				5.66%
Secured Debt | The Cosmopolitan
Debt Instrument [Line Items]
Total principal balances				$ 44,468		45,209
Stated interest rate				3.35%
Unsecured Debt
Debt Instrument [Line Items]
Total principal balances				$ 306,000		216,000
Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Total principal balances				126,000		66,000
Unsecured Debt | Term Loan Without Related Interest Rate Swap Agreemen
Debt Instrument [Line Items]
Total principal balances				80,000		50,000
Unsecured Debt | Term Loan With Related Interest Rate Swap
Debt Instrument [Line Items]
Total principal balances				$ 50,000		$ 50,000