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Other Investments - Net Lease Venture II (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2019 USD ($) | Dec. 31, 2018 USD ($) ft² lease building | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Acquisitions of real estate assets | $ 56,700 |  |  | $ 240,487 | $ 3,390
Net Lease Venture II |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interest (percent) |  |  | 51.90% | 51.90% |
Net Lease Venture II | Other income |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Management fee revenue from related party |  |  | $ 400 | $ 1,100 |
Net Lease Venture II | The Properties Livermore CA |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of properties | building |  | 4 |  |  |
Area of properties (sq ft) | ft² |  | 168,636 |  |  |
Acquisitions of real estate assets |  | $ 31,200 |  |  |
Percentage of acquired properties leased (percent) |  | 100.00% |  |  |
Number of leases | lease |  | 4 |  |  |

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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