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Investments (Tables)
12 Months Ended
Dec. 31, 2017
Griffin Capital Essential Asset REIT, Inc. [Member]  
Schedule of Equity Method Investments [Line Items]  
Schedule of the investment
As of December 31, 2017, the balance of the investment is shown below:
 
 
Digital Realty
Joint Venture
Balance as of December 31, 2016
 
$
46,313

Other comprehensive income
 
465

Net loss
 
(2,065
)
Distributions
 
(7,599
)
Balance as of December 31, 2017
 
$
37,114