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Investments in Real Estate (Details)
ft² in Thousands, $ in Thousands, € in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 01, 2016
USD ($)
Aug. 01, 2016
EUR (€)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
EUR (€)
Jun. 30, 2016
USD ($)
property
Dec. 31, 2014
USD ($)
property
Jul. 11, 2016
USD ($)
ft²
property
Jul. 05, 2016
USD ($)
ft²
property
Dec. 31, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property           140        
Assets | $           $ 11,292,375       $ 11,416,063
Liabilities | $           $ 6,966,733       $ 6,879,561
Midwest and Northeast Regions                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Impairment of investments in real estate | $             $ 126,500      
Number of properties | property           5 5      
Held-for-sale                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property           8        
Assets | $           $ 222,300        
Liabilities | $           $ 13,100        
Held-for-sale | Midwest and Northeast Regions                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property           3        
Held-for-sale | Capital Recycling Strategy                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property           4        
Disposed of by sale | Data Center Portfolio, St Louis and Northern Virginia                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property           4        
Disposed of by sale | Data Center Portfolio, St Louis and Northern Virginia | Forecast                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain on Sale | $     $ 27,000              
47700 Kato Road and 1055 Page Avenue                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gross Proceeds | $           $ 37,500        
Gain on Sale | $           $ 1,000        
Equinix | Forecast                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain on Sale | $     142,000              
Subsequent Event | Disposed of by sale | Data Center Portfolio, St Louis and Northern Virginia                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gross Proceeds | $               $ 113,000    
Gain on Sale | $     $ 27,000              
Number of properties | property               4    
Sellable square feet comprised in portfolio (in sqft) | ft²               454    
Value of property sale transaction | $               $ 115,000    
Subsequent Event | St. Louis | Disposed of by sale | Data Center Portfolio, St Louis and Northern Virginia                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property               2    
Subsequent Event | Northern Virginia | Disposed of by sale | Data Center Portfolio, St Louis and Northern Virginia                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property               2    
Subsequent Event | Equinix                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property                 8  
Transaction value | $                 $ 874,000  
Sellable square feet comprised in portfolio (in sqft) | ft²                 213  
Business combination, consideration transferred $ 212,000 € 190   $ 212,000 € 190          
Subsequent Event | Equinix | London                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property                 5  
Subsequent Event | Equinix | Amsterdam                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property                 2  
Subsequent Event | Equinix | Frankfurt                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of properties | property                 1