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Real Estate - Restricted Cash (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2016
Real Estate [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 12,886 | $ 14,642 | $ 14,221
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |
Real Estate [Line Items] |  |  |
Restricted Cash and Cash Equivalents | 174,132 | 22,365 | $ 13,420
Griffin Capital Essential Asset REIT, Inc. [Member] | Real Estate Asset Acquisitions and Contributions [Member] | Cash reserves |  |  |
Real Estate [Line Items] |  |  |
Restricted Cash and Cash Equivalents | 17,034 | 20,619 |
Griffin Capital Essential Asset REIT, Inc. [Member] | Real Estate Asset Acquisitions and Contributions [Member] | Midland mortgage loan restricted lockbox |  |  |
Real Estate [Line Items] |  |  |
Restricted Cash and Cash Equivalents | 2,158 | 1,746 |
Griffin Capital Essential Asset REIT, Inc. [Member] | Real Estate Asset Acquisitions and Contributions [Member] | 1031 Exchange Funds |  |  |
Real Estate [Line Items] |  |  |
Restricted Cash and Cash Equivalents | 154,940 | $ 0 |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 13,420 |  |
Additions | 376,481 |  |
Deductions | (215,770) |  |
Ending balance | 174,131 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Tenant Improvement Reserves [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 9,238 |  |
Additions | 5,468 |  |
Deductions | (1,071) |  |
Ending balance | 13,635 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Midland mortgage loan restricted lockbox |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 1,468 |  |
Additions | 2,158 |  |
Deductions | (1,468) |  |
Ending balance | 2,158 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | 1031 Exchange Funds |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 0 |  |
Additions | 286,711 |  |
Deductions | (131,771) |  |
Ending balance | 154,940 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Midland Mortgage Loan Reserves [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 67 |  |
Additions | 323 |  |
Deductions | 0 |  |
Ending balance | 390 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Real Estate Tax Reserves [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 1,645 |  |
Additions | 3,344 |  |
Deductions | (2,892) |  |
Ending balance | 2,097 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Property Insurance Reserves [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 257 |  |
Additions | 467 |  |
Deductions | (499) |  |
Ending balance | 225 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Rent Abatement Reserve [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 0 |  |
Additions | 731 |  |
Deductions | (390) |  |
Ending balance | 341 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Restricted Deposit/Leasing Commission Reserve [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 745 |  |
Additions | 4 |  |
Deductions | (404) |  |
Ending balance | 345 |  |
Leases, Acquired-in-Place [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Holdback Escrow [Member] |  |  |
Restricted Cash [Roll Forward] |  |  |
Beginning balance | 0 |  |
Additions | 77,275 |  |
Deductions | (77,275) |  |
Ending balance | $ 0 |  |

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