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Investments - Balance of Investments (Details) - Griffin Capital Essential Asset REIT, Inc. [Member] - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest |  |  |  |  |  | $ 500,000 |  |
Investments [Roll Forward] |  |  |  |  |  |  |  |
Balance as of December 31, 2017 |  |  |  | $ 37,114,000 | $ 46,313,000 | 46,313,000 |  |
Initial contribution |  |  |  | 3,266,000 | 0 | 0 | $ 18,129,000 | $ 0
Net loss |  | $ (579,000) | $ (517,000) | (1,617,000) | (1,511,000) | (2,065,000) | (1,640,000) | (1,475,000)
Distributions |  |  |  | (5,627,000) |  |  |  |
Other comprehensive income |  | (12,000) | $ 311,000 | 224,000 | 489,000 | 465,000 | 241,000 | $ (189,000)
Balance as of September 30, 2018 |  | 33,360,000 |  | 33,360,000 |  | 37,114,000 | 46,313,000 |
Digital Realty Joint Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest |  |  |  |  |  | 465,000 |  |
Investments [Roll Forward] |  |  |  |  |  |  |  |
Balance as of December 31, 2017 |  |  |  | 37,114,000 | $ 46,313,000 | 46,313,000 |  |
Initial contribution |  |  |  | 0 |  |  |  |
Net loss |  |  |  | (1,617,000) |  | (2,065,000) |  |
Distributions |  |  |  | (5,627,000) |  | (7,599,000) |  |
Other comprehensive income |  |  |  | 224,000 |  |  |  |
Balance as of September 30, 2018 |  | 30,094,000 |  | 30,094,000 |  | 37,114,000 | $ 46,313,000 |
Heritage Common X |  |  |  |  |  |  |  |
Investments [Roll Forward] |  |  |  |  |  |  |  |
Balance as of December 31, 2017 |  |  |  | 0 |  |  |  |
Initial contribution | $ 3,100,000 |  |  | 3,266,000 |  |  |  |
Net loss |  |  |  | 0 |  |  |  |
Distributions |  |  |  | 0 |  |  |  |
Other comprehensive income |  |  |  | 0 |  |  |  |
Balance as of September 30, 2018 |  | $ 3,266,000 |  | $ 3,266,000 |  | $ 0 |  |

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