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Credit Facility (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
item
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Credit facility        
Outstanding balance $ 653,000   $ 238,000  
Credit Facility        
Credit facility        
Maximum borrowing capacity   $ 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 $ 9,500      
Credit facility origination costs incurred     9,100  
Current borrowing capacity available 1,350,000      
Outstanding balance $ 653,000   $ 238,000  
Average borrowing rate during the period (as a percent) 1.50% 1.20%    
Effective interest rate (as a percent) 1.40%      
Increase in the maximum borrowing capacity after amendment $ 1,000,000