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Investments in Real Estate - Acquisitions (Details)
ft² in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
ft²
item
Dec. 31, 2016
USD ($)
ft²
item
Dec. 31, 2015
USD ($)
Investments in real estate properties        
Leasable square feet | ft²   89.6    
Total Revenue   $ 1,215,768,000 $ 1,103,172,000 $ 1,023,285,000
Net income   $ 319,318,000 316,477,000 $ 284,855,000
Real Estate Investment        
Investments in real estate properties        
Number of investments in properties that caused any tenant to be 10% of more of total assets | item   0    
Total Revenue   $ 37,100,000 44,600,000  
Net income   17,900,000 22,000,000  
Real Estate Investment | General and administrative expense        
Investments in real estate properties        
Acquisition transaction costs   255,000 346,000  
Real Estate Investment | New and under development or expansion        
Investments in real estate properties        
Value of properties acquired during the period   $ 1,520,000,000 $ 1,860,000,000  
Number of properties acquired during the period | item   303 505  
Initial weighted average contractual lease rate of properties acquired (as a percent)   6.40% 6.30%  
Number of states in which properties are located | item   40 40  
Leasable square feet | ft²   7.8 8.2  
Leased area (as a percent)   100.00% 100.00%  
Weighted average lease term   14 years 4 months 24 days 14 years 8 months 12 days  
Allocated to Land   $ 354,100,000 $ 517,600,000  
Allocated to Buildings and Improvements   955,100,000 1,180,000,000  
Allocated to Intangible Assets related to Leases   228,000,000 204,500,000  
Allocated to Intangible Liabilities related to Leases and Other Assumed Liabilities   17,800,000 38,800,000  
Contingent consideration associated with acquisition   $ 0 $ 0  
Real Estate Investment | New properties        
Investments in real estate properties        
Number of industries in which tenants operate | item   23 28  
Real Estate Investment | New properties | Retail        
Investments in real estate properties        
Property type- percentage of properties acquired   94.50% 86.40%  
Real Estate Investment | New properties | Industrial        
Investments in real estate properties        
Property type- percentage of properties acquired   5.50% 13.60%  
Real Estate Investment | Properties under development        
Investments in real estate properties        
Number of properties acquired during the period | item   17 33  
Initial weighted average contractual lease rate of properties acquired (as a percent)   6.90% 7.10%  
Investments in properties   $ 21,200,000 $ 103,800,000  
Real Estate Investment | Maximum        
Investments in real estate properties        
Investments to any one tenant as a percentage of total assets   10.00%    
ASU 2017-10 | Real Estate Investment        
Investments in real estate properties        
Acquisition transaction costs $ 34,000