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Debt - Senior Unsecured Credit Facility (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
May 03, 2016
USD ($)
May 02, 2016
USD ($)
Dec. 31, 2015
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       $ 0
Senior unsecured credit facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity         $ 300,000,000 $ 200,000,000  
Increase in credit facility         600,000,000    
Senior unsecured credit facility 0   0   $ 75,000,000    
Interest and unused credit facility fees $ 200,000 $ 400,000 $ 1,100,000 $ 800,000      
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) 0.221   0.221        
Minimum fixed charge coverage ratio     4.32        
Minimum tangible net worth $ 2,540,000,000   $ 2,540,000,000        
Secured recourse indebtedness ratio     27.60%        
Line Of Credit Facility Covenant              
Line of Credit Facility [Line Items]              
Maximum leverage ratio (as a percent) 0.60   0.60        
Minimum fixed charge coverage ratio     1.5        
Minimum tangible net worth $ 1,913,306,000   $ 1,913,306,000        
Secured recourse indebtedness ratio     45.00%        
LIBOR | Senior unsecured credit facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.50%   150.00%        
LIBOR | Minimum | Senior unsecured credit facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate     1.75%        
LIBOR | Maximum | Senior unsecured credit facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate     2.75%