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Debt - Schedule of Credit Agreement Terms (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jul. 31, 2019
Feb. 28, 2019
Debt Instrument [Line Items]        
Revolving credit facility borrowings $ 130,000,000 $ 0    
Unsecured Term Loan        
Debt Instrument [Line Items]        
Unamortized debt issuance costs 2,435,000 $ 2,561,000    
Unsecured Revolving Credit Facility, Expiring August 2019 | Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 600,000,000
Revolving credit facility borrowings 130,000,000      
Remaining borrowing capacity 470,000,000      
Unsecured Term Loan, Expiring January 2025 | Unsecured Term Loan        
Debt Instrument [Line Items]        
Face amount of debt instrument $ 300,000,000      
Stated interest rate     2.732%  
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring August 2019 | Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.90%      
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring August 2019 | Unsecured Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.775%      
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring August 2019 | Unsecured Revolving Credit Facility | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.45%      
London Interbank Offered Rate (LIBOR) | Unsecured Term Loan, Expiring January 2025 | Unsecured Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.00%