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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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