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Debt - Schedule of Credit Agreement Terms (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jul. 31, 2019
Feb. 28, 2019
Unsecured Term Loan        
Debt Instrument [Line Items]        
Unamortized debt issuance costs $ 2,183,000 $ 2,561,000    
Unsecured Revolving Credit Facility, Expiring February 2023 | Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 600,000,000
Revolving credit facility borrowings 0      
Remaining borrowing capacity 600,000,000      
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 February 2023 | 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 February 2023 | 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 February 2023 | 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%