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Business Combinations (DFT Merger) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 14, 2017
Sep. 29, 2017
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Land     $ 356,704 $ 87,610
Goodwill     4,348,007 3,389,595
DFT Merger        
Business Acquisition [Line Items]        
Land $ 312,579      
Buildings and improvements 3,677,497      
Cash and cash equivalents 20,650      
Accounts receivables and other assets 10,978      
Goodwill 2,592,181   $ 2,592,146 $ 2,592,146
Acquired below-market leases (185,543)      
Accounts payable and other accrued liabilities (248,259)      
Other working capital, net (22,640)      
Total consideration of assets and liabilities acquired 6,209,633      
Acquired above-market leases        
Business Acquisition [Line Items]        
Weighted average remaining intangible amortization life (in months)     2 years 10 months 1 day 65 months
Acquired above-market leases | DFT Merger        
Business Acquisition [Line Items]        
Acquired above-market leases $ 162,333      
Weighted average remaining intangible amortization life (in months) 47 months      
Tenant relationship value | DFT Merger        
Business Acquisition [Line Items]        
Acquired above-market leases $ 980,267      
Weighted average remaining intangible amortization life (in months) 220 months      
Acquired in-place lease value        
Business Acquisition [Line Items]        
Weighted average remaining intangible amortization life (in months)     6 years 4 months 10 days 81 months
Acquired in-place lease value | DFT Merger        
Business Acquisition [Line Items]        
Acquired above-market leases $ 557,128      
Weighted average remaining intangible amortization life (in months) 70 months      
Tenant origination costs | DFT Merger        
Business Acquisition [Line Items]        
Acquired above-market leases $ 44,990      
Weighted average remaining intangible amortization life (in months) 80 months      
Acquired below-market leases        
Business Acquisition [Line Items]        
Weighted average remaining intangible amortization life (in months)       80 months
Acquired below-market leases | DFT Merger        
Business Acquisition [Line Items]        
Weighted average remaining intangible amortization life (in months) 137 months      
Global revolving credit facilities | DFT Merger        
Business Acquisition [Line Items]        
Long term debt $ (450,697)      
Unsecured term loans | DFT Merger        
Business Acquisition [Line Items]        
Long term debt (250,000)      
Unsecured senior notes | DFT Merger        
Business Acquisition [Line Items]        
Long term debt (886,831)      
Debt paid off at closing of merger   $ 621,000    
Mortgage loans | DFT Merger        
Business Acquisition [Line Items]        
Long term debt $ (105,000)