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Debt - Summary of Unsecured Term Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jul. 17, 2019
Dec. 31, 2018
Nov. 20, 2018
Jan. 03, 2017
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 | Term Loan Due 2023          
Debt Instrument [Line Items]          
Reference rate for variable interest rate       LIBOR  
Variable interest rate spread (as a percent) 1.20%   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%     1.20%  
Minimum | LIBOR | Term Loan Due 2024          
Debt Instrument [Line Items]          
Variable interest rate spread (as a percent) 1.20% 1.20%      
Minimum | LIBOR | Term Loan Due 2026          
Debt Instrument [Line Items]          
Variable interest rate spread (as a percent) 1.50% 1.50%      
Maximum | LIBOR | Term Loan Due 2023          
Debt Instrument [Line Items]          
Variable interest rate spread (as a percent) 1.85%     1.85%  
Maximum | LIBOR | Term Loan Due 2024          
Debt Instrument [Line Items]          
Variable interest rate spread (as a percent) 1.70% 1.70%      
Maximum | LIBOR | Term Loan Due 2026          
Debt Instrument [Line Items]          
Variable interest rate spread (as a percent) 2.20% 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%