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Investments - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 17, 2019
USD ($)
Sep. 30, 2014
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
ft²
Sep. 09, 2014
Gain (Loss) on Securities [Line Items]              
Other comprehensive loss     $ 217 $ (122) $ (465)    
Heritage Common X              
Gain (Loss) on Securities [Line Items]              
Area of equity method investments (in sqft) | ft²           200,000  
Proceeds from sale of real estate $ 8,200            
Debt costs 41,400            
Gain (loss) on disposal 4,100            
Realized gain on disposal $ 600            
Escrow deposit     400        
Ownership interest (percent) 45.00%            
Other comprehensive loss     0        
Digital Realty Joint Venture              
Gain (Loss) on Securities [Line Items]              
Area of equity method investments (in sqft) | ft²   132,300          
Ownership interest (percent)   80.00%         80.00%
Acquisitions   $ 68,400          
Gross acquisition value of property   187,500          
Debt financing for acquisition of property   $ 102,000          
Operating lease term   3 years          
Other comprehensive loss     $ 217        
Mercedes-Benz Financial Services USA | Heritage Common X              
Gain (Loss) on Securities [Line Items]              
Area of real estate leased     100.00%