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Borrowing Arrangements - Term Loan Credit Facility (Details) - Secured debt - USD ($)
Jan. 01, 2019
Mar. 31, 2021
Dec. 31, 2016
Term loan credit facility      
Amount of senior secured draw term loan credit facility     $ 100,000,000
Fixed interest rate of credit facility (as a percent) 4.35%    
Repayment period of credit facility 28 years    
Fair value of investments pledged as collateral on the credit facility   $ 125,100,000