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Debt - Summary of Unsecured Term Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Term Loan Due 2023    
Debt Instrument [Line Items]    
Term of debt issuance 7 years  
Principal amount $ 200,000  
Additional borrowing capacity 100,000  
Maximum borrowing capacity $ 300,000  
Term Loan Due 2024    
Debt Instrument [Line Items]    
Term of debt issuance 5 years  
Principal amount $ 120,000  
Additional borrowing capacity $ 130,000  
Term Loan Due 2026    
Debt Instrument [Line Items]    
Term of debt issuance 7 years  
Principal amount $ 150,000  
Additional borrowing capacity 100,000  
Term Loan Due 2024 and Term Loan Due 2026    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 500,000  
LIBOR    
Debt Instrument [Line Items]    
Reference rate for variable interest rate LIBOR  
LIBOR | Term Loan Due 2023    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent)   1.20%
LIBOR | Term Loan Due 2024    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent)   1.20%
LIBOR | Term Loan Due 2026    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent)   1.50%
Minimum | LIBOR | Term Loan Due 2023    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.20%  
Minimum | LIBOR | Term Loan Due 2024    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.20%  
Minimum | LIBOR | Term Loan Due 2026    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.50%  
Maximum | LIBOR | Term Loan Due 2023    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.85%  
Maximum | LIBOR | Term Loan Due 2024    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.70%  
Maximum | LIBOR | Term Loan Due 2026    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 2.20%  
Investment grade rated | Minimum | LIBOR | Term Loan Due 2023    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 0.85%  
Investment grade rated | Minimum | LIBOR | Term Loan Due 2024    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 0.80%  
Investment grade rated | Minimum | LIBOR | Term Loan Due 2026    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.35%  
Investment grade rated | Maximum | LIBOR | Term Loan Due 2023    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.65%  
Investment grade rated | Maximum | LIBOR | Term Loan Due 2024    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 1.65%  
Investment grade rated | Maximum | LIBOR | Term Loan Due 2026    
Debt Instrument [Line Items]    
Variable interest rate spread (as a percent) 2.25%