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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |  |
Fair value of parking garage | $ 566,194,000 | $ 566,194,000 | $ 380,364,000 |
Land | 125,990,000 | 125,990,000 | 141,215,000 |
Building and other improvements | 440,204,000 | 440,204,000 | 239,149,000 |
Proceeds from final distribution |  | 0 | 5,480,000 |
Carrying value of investment | 185,096,000 | 185,096,000 |  | $ 178,728,000
Gain on sale of investment in unconsolidated entities |  |  | $ 1,434,000 |
Unconsolidated Entity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from final distribution | 366,000 | 366,000 |  |
Carrying value of investment | 0 | 0 |  |
Gain on sale of investment in unconsolidated entities | 0 | 0 |  |
The Plaza Midtown, Atlanta, GA |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Fair value of parking garage | 10,790,000 | 10,790,000 |  |
Land | 1,963,000 | 1,963,000 |  |
Building and other improvements | $ 8,827,000 | $ 8,827,000 |  |

X
- 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 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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