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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leased Assets [Line Items] |  |  |  |
2018 |  |  | $ 71,662 |
Remaining 2018 | $ 19,311 |  |  |
2019 | 78,887 |  | 78,887 |
2020 | 80,492 |  | 80,492 |
2021 | 72,677 |  | 72,677 |
2022 | 73,538 |  | 73,538 |
Thereafter | 528,803 |  | 528,803 |
Total | 853,708 |  | 906,059 |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Rent expense |  |  | 400 | $ 400
2018 |  |  | 231,620 |
Remaining 2018 | 61,164 |  |  |
2019 | 226,557 |  | 210,449 |
2020 | 204,640 |  | 188,653 |
2021 | 191,182 |  | 174,053 |
2022 | 182,708 |  | 164,494 |
Thereafter | 803,849 |  | 664,226 |
Total | 1,670,100 |  | 1,633,495 |
Griffin Capital Essential Asset REIT, Inc. [Member] | Ground Lease |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Rent expense | 1,300 | $ 1,300 |  |
2018 |  |  | 198 |
Remaining 2018 | 258 |  |  |
2019 | 1,032 |  | 198 |
2020 | 1,032 |  | 198 |
2021 | 1,032 |  | 198 |
2022 | 1,072 |  | 218 |
Thereafter | 200,446 |  | 33,631 |
Total | $ 204,872 |  | $ 34,641 |

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