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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) segment property | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Number of reportable segments | segment | 3 |  |
Net cash provided by (used in) investing activities | $ (26,279,000) | $ (39,303,000) |
Net cash provided by (used in) operating activities | 22,939,000 | 24,489,000 |
Capitalized acquisition costs | $ 100,000 |  |
Acquisition costs expensed |  | 300,000 |
Accounting Standards Update 2014-09 |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Cumulative effect of new accounting principle during period |  |  | $ 0
Accounting Standards Update 2016-15 |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Net cash provided by (used in) investing activities |  | 7,300,000 |
Net cash provided by (used in) operating activities |  | (7,300,000) |
Accounting Standards Update 2016-18 |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Net cash provided by (used in) operating activities |  | (1,000,000) |
Increase (decrease) in cash and cash equivalents |  | 1,000,000 |
Operating Partnership, as General Partner or Managing Member |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Equity interest held by Operating Partnership | 94.00% |  | 95.00%
Remaining funds rate of distribution to operating partnership (in percent) | 20.00% |  |
Institutional Investors |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Remaining funds rate of distribution to all partners (in percent) | 80.00% |  |
Core Portfolio |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Number of retail properties | property | 118 |  |
Properties owned percentage | 100.00% |  |
Acquisition costs expensed |  | $ 200,000 |
Opportunity Funds |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Number of retail properties | property | 57 |  |
Core Portfolio and Opportunity Funds |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Number of retail properties | property | 175 |  |

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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