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Real Estate - Acquisitions and Conversions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 46,596 |  | $ 254,532
Debt assumed | 0 |  | 0
Capitalized acquisition costs | 100 |  |
Acquisition costs expensed |  | $ 300 |
Purchase Price Allocation |  |  |
Land | 9,012 |  | 48,138
Buildings and improvements | 34,064 |  | 173,576
Other assets | 0 |  | 84
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 6,499 |  | 44,269
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (2,979) |  | (11,535)
Net assets acquired | 46,596 |  | 254,532
Consideration |  |  |
Cash | 46,171 |  | 200,429
Conversion of note receivable | 0 |  | 41,010
Liabilities assumed | 425 |  | 3,363
Existing interest in previously unconsolidated investment | 0 |  | 4,159
Change in control of previously unconsolidated investment | 0 |  | 5,571
Total Consideration | 46,596 |  | 254,532
Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 1,337 |  | 42,800
Debt assumed | $ 0 |  | $ 0
Acquisition costs expensed |  | 200 |
Core Portfolio | Bedford Green Land Parcel |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 1,337 |  |
Debt assumed | 0 |  |
Core Portfolio | Market Square Shopping Center | Wilmington, DE |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 42,800
Debt assumed |  |  | 0
Funds Segment |  |  |
Business Acquisition [Line Items] |  |  |
Capitalized acquisition costs | 100 |  |
Acquisition costs expensed |  | $ 100 |
Fund IV |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price |  |  | 44,492
Debt assumed |  |  | $ 0
Fund IV | Lincoln Place - Fairview Heights, IL | Fairview Heights, IL |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 35,350
Debt assumed |  |  | $ 0
Fund IV | Shaw's Plaza Waterville, ME | Windham, ME |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 9,142
Debt assumed |  |  | 0
Fund V |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 45,259 |  | 167,240
Debt assumed | $ 0 |  | $ 0
Fund V | Trussville Promenade - Trussville, AL | Trussville, AL |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 45,259 |  |
Debt assumed | $ 0 |  |
Fund V | Plaza Santa Fe - Santa Fe, NM | Santa Fe, NM |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 35,220
Debt assumed |  |  | $ 0
Fund V | Hickory Ridge - Hickory, NC | Hickory, NC |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 44,020
Debt assumed |  |  | $ 0
Fund V | New Towne Plaza - Canton, MI | Canton, MI |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 26,000
Debt assumed |  |  | $ 0
Fund V | Fairlane Green | Allen Park, MI |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 62,000
Debt assumed |  |  | $ 0

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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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