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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Variable Interest Entity [Line Items] |  |  |  |
Acquisition date fair value | $ 566,194,000 | $ 439,335,000 |  |
Land | 125,990,000 | 154,737,000 |  |
Building and other improvements | 440,204,000 | 284,598,000 |  |
Investment in unconsolidated entities | 180,764,000 | 178,728,000 |  |
Realized gain (loss) on disposal |  | 1,434,000 |  |
Gain, (loss) and (impairment) of investment in unconsolidated entities, net | 0 | 1,434,000 | $ 326,000 |
PLAZA MIDTOWN Atlanta, GL |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Acquisition date fair value | 10,790,000 |  |  |
Land | 1,963,000 |  |  |
Building and other improvements | 8,827,000 |  |  |
Unconsolidated Entity 1 [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from equity method investment, dividends or distributions, return of capital | 366,000 |  |  |
Investment in unconsolidated entities | 0 |  |  |
Realized gain (loss) on disposal | 0 |  |  |
Unconsolidated Entities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity method investment, other than temporary impairment | 0 | 0 | 0 |
Investment in unconsolidated entities | 180,764,000 | 178,728,000 |  |
Gain, (loss) and (impairment) of investment in unconsolidated entities, net |  |  | 326,000 |
Debt, net | 312,233,000 |  |  |
Unconsolidated Entities [Member] | Downtown Railyard Venture, LLC [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from equity method investment, dividends or distributions, return of capital |  |  | $ 4,092,000 |
Investment in unconsolidated entities | 57,183,000 | $ 52,365,000 |  | $ 46,174,000
IAGM Retail Fund I, LLC [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Recourse debt | $ 23,000,000 |  |  |

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- Definition Gain and loss is the difference between the book value and the sale price of investments in joint ventures and entities in which the reporting entity has an equity ownership interest and exercises significant influence. Impairment represents other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. + References No definition available. + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=99375318&loc=d3e32787-111569 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585 + Details
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