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Debt - Senior Unsecured Credit Facility (Details)
 3 Months Ended 6 Months Ended
Jul. 25, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Aug. 06, 2019
USD ($)
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   $ 105,000,000   $ 105,000,000     $ 0
Debt repaid       6,863,000 $ 6,781,000    
Unsecured credit facility              
Line of Credit Facility [Line Items]              
Accordion feature, higher borrowing capacity   1,200,000,000   1,200,000,000      
Interest and unused credit facility fees   $ 1,000,000.0 $ 300,000 $ 1,700,000 $ 700,000    
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   0.60      
Minimum fixed charge coverage ratio       1.50      
Minimum tangible net worth   $ 1,980,000,000   $ 1,980,000,000      
Minimum tangible net worth (3)       45.00%      
Line Of Credit Facility Covenant Actual Results              
Line of Credit Facility [Line Items]              
Maximum leverage ratio (as a percent)   0.298   0.298      
Minimum fixed charge coverage ratio       4.06      
Minimum tangible net worth   $ 2,780,000,000   $ 2,780,000,000      
Minimum tangible net worth (3)       18.40%      
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       0.5      
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       0.5      
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           $ 20,000,000.0  
Subsequent Event | Unsecured credit facility              
Line of Credit Facility [Line Items]              
Debt repaid $ 50,000,000            
Senior Unsecured Credit Facility | Unsecured credit facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   300,000,000   $ 300,000,000      
Accordion feature, higher borrowing capacity   600,000,000   600,000,000      
Senior unsecured credit facility   $ 105,000,000.0   $ 105,000,000.0     $ 0
Senior Unsecured Credit Facility | LIBOR | Unsecured credit facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       1.50%      
Senior Unsecured Credit Facility | Subsequent Event | Unsecured credit facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 400,000,000            
Senior Unsecured Credit Facility | Subsequent Event | LIBOR | Minimum | Unsecured credit facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.40%            
Senior Unsecured Credit Facility | Subsequent Event | LIBOR | Maximum | Unsecured credit facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 2.05%