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Debt - Senior Unsecured Credit Facility (Details)
 3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent) 50.00%    
Net proceeds from future equity issuances (as a percent) 75.00%    
Senior unsecured credit facility $ 0   $ 0
Unsecured credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 300,000,000    
Increase in credit facility 600,000,000    
Senior unsecured credit facility 0    
Interest and unused credit facility fees $ 300,000 $ 500,000  
Minimum      
Line of Credit Facility [Line Items]      
Line of credit facility, unused capacity, commitment fee (as a percent) 0.20%    
Maximum      
Line of Credit Facility [Line Items]      
Line of credit facility, unused capacity, commitment fee (as a percent) 0.30%    
Line Of Credit Facility Covenant Actual Results      
Line of Credit Facility [Line Items]      
Maximum leverage ratio (as a percent) 0.252    
Minimum fixed charge coverage ratio 4.65    
Minimum tangible net worth $ 2,550,000,000    
Secured recourse indebtedness ratio 26.80%    
Line Of Credit Facility Covenant      
Line of Credit Facility [Line Items]      
Maximum leverage ratio (as a percent) 0.60    
Minimum fixed charge coverage ratio 1.5    
Minimum tangible net worth $ 1,913,306,000    
Secured recourse indebtedness ratio 45.00%    
LIBOR | Unsecured credit facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.50%    
LIBOR | Minimum | Unsecured credit facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.75%    
LIBOR | Maximum | Unsecured credit facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 2.75%