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Real Estate Real Estate - Amortization Income (Expense) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization of above and below Market Leases $ (3,511) $ (3,389) $ (4,573) $ (3,592) $ (1,858)
Amortization of Deferred Leasing Fees     23,756 16,264 7,145
Griffin Capital Essential Asset REIT, Inc. [Member]          
Remaining 2018 (386)        
Remaining 2018 11,150        
Remaining 2018 21        
Remaining 2018 2,389        
2019 (2,464)        
2019 38,096        
2019 21        
2019 4,765        
2020 (936)        
2020 29,867        
2020 21        
2020 4,712        
2021 (717)        
2021 25,170        
2021 21        
2021 4,830        
2022 (1,058)        
2022 22,938        
2022 21        
2022 4,818        
Amortization of above and below Market Leases $ (135) $ 1,310 1,689 3,287 (3,785)
Amortization of Deferred Leasing Fees     59,046 72,912 69,099
Amortization Of Ground Leasehold Interest     27 28 28
Amortization of Other Leasing Costs     $ 1,527 $ 1,202 $ 301