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Debt - Senior Unsecured Credit Facility (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
May 09, 2019
USD ($)
Dec. 31, 2018
USD ($)
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 $ 60,000,000     $ 0
Unsecured credit facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity (up to) 300,000,000      
Increase in credit facility 600,000,000      
Interest and unused credit facility fees $ 700,000 $ 400,000    
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        
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 $ 1,980,000,000      
Secured recourse indebtedness ratio 45.00%      
Line Of Credit Facility Covenant Actual Results        
Line of Credit Facility [Line Items]        
Maximum leverage ratio (as a percent) 0.291      
Minimum fixed charge coverage ratio 4.13      
Minimum tangible net worth $ 2,750,000,000      
Secured recourse indebtedness ratio 18.60%      
LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.50%      
Less than or equal to 35% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.35      
Less than or equal to 35% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.50%      
Greater than 35% but less than or equal to 45% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.35      
Greater than 35% but less than or equal to 45% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.45      
Greater than 35% but less than or equal to 45% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.65%      
Greater than 45% but less than or equal to 50% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.45      
Greater than 45% but less than or equal to 50% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.50      
Greater than 45% but less than or equal to 50% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.80%      
Greater than 50% but less than or equal to 55% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.50      
Greater than 50% but less than or equal to 55% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.55      
Greater than 50% but less than or equal to 55% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 2.00%      
Greater than 55% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio of net indebtedness to EBITDA 0.55      
Greater than 55% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 2.25%      
Subsequent Event        
Line of Credit Facility [Line Items]        
Senior unsecured credit facility     $ 30,000,000