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Credit Facility (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
Dec. 31, 2016
USD ($)
Credit facility      
Unamortized debt issuance costs $ 5,823   $ 7,303
Outstanding balance $ 648,000   1,120,000
Credit Facility      
Credit facility      
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%    
Current borrowing capacity available $ 1,350,000    
Outstanding balance $ 648,000   $ 1,120,000
Weighted average borrowing rate during the period (as a percent) 1.80% 1.40%  
Weighted average interest rate at the end of the period (as a percent) 2.10% 1.50%  
Credit Facility | Unsecured debt      
Credit facility      
Maximum borrowing capacity $ 2,000,000    
Line Of Credit Facility Number Of Extensions | item 2    
Term of extension option 6 months    
Increase in the maximum borrowing capacity after amendment $ 1,000,000