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Debt - Secured Revolving and Term Credit Facility (Details)
 1 Months Ended 9 Months Ended
Jan. 23, 2015
USD ($)
option
Aug. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]        
Unsecured revolving credit facility     $ 20,000,000 $ 0
Secured Revolving and Term Credit Facility        
Line of Credit Facility [Line Items]        
Write off of deferred financing costs $ 1,300,000      
Term Loan | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 365,000,000.0    
Unsecured revolving credit facility   $ 265,000,000 $ 265,000,000 0
Term Loan | Revolving Credit Facility | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.40%    
Term Loan | Revolving Credit Facility | Base Rate | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.35%    
Term Loan | Revolving Credit Facility | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.60%  
Term Loan | Revolving Credit Facility | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.40%    
Term Loan | Revolving Credit Facility | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   2.35%    
Unsecured Revolving Credit Facility | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Current borrowing capacity 800,000,000      
Maximum borrowing capacity $ 1,250,000,000.00      
Unsecured revolving credit facility     $ 20,000,000 0
Option to extend maturity, number | option 2      
Extension period 6 months      
Extension fee percent of outstanding commitments under revolving credit facility 0.075%      
Maximum leverage ratio 60.00%      
Maximum consolidated secured indebtedness to asset value 40.00%      
Minimum tangible net worth $ 745,400,000.0      
Tangible net worth. minimum percent of net equity proceeds received 75.00%      
Minimum adjusted EBITDA to consolidated fixed charges 1.50      
Minimum net operating income to unsecured debt 1.75      
Maximum ratio of unsecured debt to unencumbered asset value 60.00%      
Maximum consolidated secured recourse debt to asset value 10.00%      
Unsecured Revolving Credit Facility | Revolving Credit Facility | Eurodollar | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.875%      
Unsecured Revolving Credit Facility | Revolving Credit Facility | Eurodollar | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.60%      
Unsecured Revolving Credit Facility | Revolving Credit Facility | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.00%      
Unsecured Revolving Credit Facility | Revolving Credit Facility | Base Rate | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.60%      
Unsecured Revolving Credit Facility | Revolving Credit Facility | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.15%  
Secured Revolving and Term Credit Facility | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Unsecured revolving credit facility       $ 470,000,000