Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands			12 Months Ended
	Jul. 30, 2015	Jul. 10, 2015	Dec. 31, 2016	Dec. 31, 2015	Jul. 01, 2015	May 27, 2015
Debt Instrument [Line Items]
Total principal balance			$ 527,082	$ 382,013
Unamortized fair value adjustments			(1,250)	(1,287)
Unamortized debt issuance costs			(3,652)	(3,133)
Indebtedness, net			522,180	377,593
Revolving Credit Facility
Debt Instrument [Line Items]
Total principal balance			107,000	74,000
Term Loan With Related Hedging Instrument
Debt Instrument [Line Items]
Total principal balance			50,000	50,000
Terrm Loan Without Related Hedging Instrument
Debt Instrument [Line Items]
Total principal balance			$ 50,000	0
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 With Related Hedging Instrument | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.35%
LIBOR | Term Loan With Related Hedging Instrument | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.95%
LIBOR | Terrm Loan Without Related Hedging Instrument | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.35%
LIBOR | Terrm Loan Without Related Hedging Instrument | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.95%
249 Central Park Retail
Debt Instrument [Line Items]
Total principal balance			$ 17,076	15,282
249 Central Park Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.95%
Fountain Plaza Retail
Debt Instrument [Line Items]
Total principal balance			$ 10,281	7,641
Fountain Plaza Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.95%
South Retail
Debt Instrument [Line Items]
Total principal balance			$ 7,493	6,742
South Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.95%
4525 Main Street
Debt Instrument [Line Items]
Total principal balance			$ 32,034	31,613
Stated interest rate			3.25%
Encore Apartments
Debt Instrument [Line Items]
Total principal balance			$ 24,966	25,184
Stated interest rate			3.25%
North Point Center | Note 5
Debt Instrument [Line Items]
Total principal balance			$ 643	664
North Point Center | Note 5 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			2.00%
North Point Center | Notes 1
Debt Instrument [Line Items]
Total principal balance			$ 9,776	9,969
Stated interest rate			6.45%
North Point Center | Notes 2
Debt Instrument [Line Items]
Total principal balance			$ 2,564	2,662
Stated interest rate			7.25%
Oyster Point
Debt Instrument [Line Items]
Total principal balance			$ 0	6,400
Oyster Point | LIBOR | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.40%
Oyster Point | LIBOR | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			2.00%
Harrisonburg Regal
Debt Instrument [Line Items]
Total principal balance			$ 3,256	3,463
Stated interest rate			6.06%
Commonwealth of Virginia | Chesapeake
Debt Instrument [Line Items]
Total principal balance			$ 4,933	4,933
Commonwealth of Virginia | LIBOR | Chesapeake
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.90%
Hanbury Village | Notes 1
Debt Instrument [Line Items]
Total principal balance			$ 20,709	20,970
Stated interest rate			6.67%
Lightfoot Marketplace
Debt Instrument [Line Items]
Total principal balance			$ 12,194	7,759
Lightfoot Marketplace | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.90%
Sandbridge Commons
Debt Instrument [Line Items]
Total principal balance			$ 9,376	9,010
Sandbridge Commons | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.85%
Southgate Square
Debt Instrument [Line Items]
Total principal balance			$ 21,150	0
Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			2.00%
Columbus Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		2.00%
Columbus Village | Notes 1
Debt Instrument [Line Items]
Total principal balance			$ 6,258	6,429
Columbus Village | Notes 1 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			2.00%
Columbus Village | Notes 2
Debt Instrument [Line Items]
Total principal balance			$ 2,266	2,310
Columbus Village | Notes 2 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			2.00%
Johns Hopkins Village
Debt Instrument [Line Items]
Total principal balance			$ 43,841	3,968
Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate	1.90%		1.90%
Socastee Commons
Debt Instrument [Line Items]
Total principal balance			$ 4,866	4,957
Stated interest rate			4.57%		4.57%
Socastee Commons | LIBOR | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.35%
Socastee Commons | LIBOR | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.95%
Smith's Landing
Debt Instrument [Line Items]
Total principal balance			$ 20,511	21,226
Stated interest rate			4.05%			4.05%
Liberty Apartments
Debt Instrument [Line Items]
Total principal balance			$ 20,005	20,312
Stated interest rate			5.66%
The Cosmopolitan
Debt Instrument [Line Items]
Total principal balance			$ 45,884	$ 46,519
Stated interest rate			3.75%