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Real Estate - Acquisitions and Conversions - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capitalized acquisition costs |  |  |  |  |  |  |  |  | $ 300,000 |  |
Acquisition costs expensed |  |  |  |  |  |  |  |  | 2,100,000 | $ 2,100,000 | $ 8,200,000
Debt assumed |  |  |  |  |  |  |  |  | 0 | 0 |
Net (loss) income | $ (6,671,000) | $ (2,597,000) | $ (2,270,000) | $ (4,160,000) | $ 24,944,000 | $ 13,285,000 | $ 6,108,000 | $ 19,971,000 | (15,698,000) | 64,308,000 | $ 134,592,000
Consolidated Acquisitions And Conversions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 10,200,000 |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:RealEstateMember | us-gaap:RealEstateMember |
Net (loss) income |  |  |  |  |  |  |  |  | $ 500,000 | $ 3,500,000 |
Core Portfolio |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition costs expensed |  |  |  |  |  |  |  |  |  | 1,200,000 |
Fund Portfolio |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition costs expensed |  |  |  |  |  |  |  |  |  | $ 900,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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