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Acquired Properties - Schedule of Retail Properties Acquired (Details) sqft in Thousands, ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($) sqft ft²	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Gross acquisition price	$ 633,425
Loans assumed	41,717	$ 16,000	$ 0
Transaction costs capitalized during the period	1,911	220
Retail Site [Member]
Business Acquisition [Line Items]
Gross acquisition price	$ 633,425	$ 465,177
Square Feet | ft²	1,683	1,499
Retail Site [Member] | CAMPUS MARKETPLACE San Marcos, CA
Business Acquisition [Line Items]
Gross acquisition price	$ 73,350
Square Feet | ft²	144
Retail Site [Member] | PARAISO PARC AND WESTFORK PLAZA Pembroke Pines, FL
Business Acquisition [Line Items]
Gross acquisition price	$ 163,000
Square Feet | ft²	386
Retail Site [Member] | THE SHOPS AT TOWN CENTER Germantown, MD
Business Acquisition [Line Items]
Gross acquisition price	$ 53,550
Square Feet | ft²	125
Retail Site [Member] | CARY PARK TOWN CENTER Cary, NC
Business Acquisition [Line Items]
Gross acquisition price	$ 25,000
Square Feet | ft²	93
Retail Site [Member] | THE PARKE Cedar Park, TX
Business Acquisition [Line Items]
Gross acquisition price	$ 112,250
Square Feet | ft²	364
Retail Site [Member] | PLAZA MIDTOWN Atlanta, GL
Business Acquisition [Line Items]
Gross acquisition price	$ 31,800
Square Feet | ft²	70
Retail Site [Member] | River Oaks
Business Acquisition [Line Items]
Gross acquisition price	$ 115,000
Square Feet | ft²	275
Retail Site [Member] | KYLE MARKETPLACE Kyle, TX
Business Acquisition [Line Items]
Gross acquisition price	$ 59,475
Square Feet | ft²	226
Retail Site [Member] | Shops at the Galleria
Business Acquisition [Line Items]
Gross acquisition price		$ 132,000
Square Feet | ft²		538
Retail Site [Member] | RENAISSANCE CENTER Durham, NC
Business Acquisition [Line Items]
Gross acquisition price		$ 129,200
Square Feet | ft²		363
Retail Site [Member] | STEVENSON RANCH Stevenson Ranch, CA
Business Acquisition [Line Items]
Gross acquisition price		$ 72,500
Square Feet | ft²		187
Retail Site [Member] | The Pointe at Creedmoor
Business Acquisition [Line Items]
Gross acquisition price		$ 16,977
Square Feet | ft²		60
Retail Site [Member] | WINDWARD COMMONS Alpharetta, GA
Business Acquisition [Line Items]
Gross acquisition price		$ 27,650
Square Feet | ft²		117
Retail Site [Member] | Old Grove Marketplace
Business Acquisition [Line Items]
Gross acquisition price		$ 23,250
Square Feet | ft²		81
Retail Site [Member] | Northcross Commons
Business Acquisition [Line Items]
Gross acquisition price		$ 31,000
Square Feet | sqft		63
Retail Site [Member] | Riverwalk Market
Business Acquisition [Line Items]
Gross acquisition price		$ 32,600
Square Feet | sqft		90

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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