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Credit Facility (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Credit facility        
Outstanding balance $ 439,000     $ 223,000
Credit Facility        
Credit facility        
Maximum borrowing capacity   $ 1,500,000   1,500,000
Credit Facility | Unsecured debt        
Credit facility        
Maximum borrowing capacity     $ 2,000,000  
Number of extensions available | item 2      
Term of extension option 6 months      
Variable reference rate LIBOR      
Variable interest rate, basis points spread over variable reference rate (as a percent) 0.90%      
Line of credit facility, commitment fee basis points (as a percent) 0.15%      
Line of credit facility, all-in drawn variable interest rate (as a percent) 1.05%      
Unamortized debt issuance costs $ 11,000      
Credit facility origination costs incurred 9,100      
Current borrowing capacity available 1,560,000      
Outstanding balance $ 439,000     $ 223,000
Average borrowing rate during the period (as a percent) 1.20% 1.20%    
Effective interest rate (as a percent) 1.30%      
Increase in the maximum borrowing capacity after amendment $ 1,000,000