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Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Payable And Accrued Liabilities [Line Items]      
Real estate taxes payable $ 3,633 $ 3,490 $ 2,678
Advance Rent 4,866 4,304 9,484
Deferred Leasing Commissions 1,900 3,783 3,783
Interest Payable, Current 2,661 3,013 1,716
Redemptions Payable, Current 6,671 2,181  
Other liabilities 2,034 3,132  
Other liabilities   5,313 3,866
Total 21,765 19,903 21,527
Griffin Capital Essential Asset REIT, Inc. [Member]      
Accounts Payable And Accrued Liabilities [Line Items]      
Prepaid rent 14,543 16,138  
Real estate taxes payable 25,666 21,087  
Prepaid rent   16,312 16,799
Real estate taxes payable   21,317 24,585
Interest payable 9,270 7,924 7,606
Interest rate swap liability   0 3,101
Other liabilities 25,455 18,457  
Other liabilities   18,580 12,914
Total $ 74,934 $ 63,606 $ 65,005