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Real Estate Acquired and Sold - Narrative (Details)	1 Months Ended				6 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2016 USD ($) property	Jun. 30, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) property
Business Acquisition [Line Items]
Aggregate cost					$ 76,400,000		$ 10,300,000
Property acquisition costs							$ 60,400
Number of properties purchased | property					1		2
Rent expense					$ 379,300	$ 427,800
Portion of purchase price allocated to land					28,400,000		$ 9,400,000
Portion of purchase price allocated to buildings					45,800,000		900,000
Portion of purchase price allocated to above market lease					600,000
Portion of purchase price allocated to leases acquired in place					2,200,000		100,000
Portion of purchase price allocated to below market lease					$ (600,000)		$ (100,000)
700 N. Glebe Road
Business Acquisition [Line Items]
Aggregate cost				$ 7,200,000
Number of contiguous properties | property				3
Thruway Pad
Business Acquisition [Line Items]
Aggregate cost				$ 3,100,000
Property acquisition costs				$ 60,400
Beacon Center
Business Acquisition [Line Items]
Aggregate cost			$ 22,500,000
Rent expense			60,000
Mortgage loans on real estate, period increase (decrease)			11,250,000
Southdale
Business Acquisition [Line Items]
Aggregate cost			15,000,000
Rent expense			$ 60,000
Burtonsville Town Square
Business Acquisition [Line Items]
Aggregate cost		$ 76,400,000
Olney
Business Acquisition [Line Items]
Aggregate cost	$ 3,000,000
Rent expense	$ 56,000

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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