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Borrowing Arrangements - Annual Principal Payments (Details) - Secured Debt
$ in Thousands
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Principal payments due in 2021 $ 2,031
Principal payments due in 2022 2,109
Principal payments due in 2023 2,226
Principal payments due in 2024 2,302
Principal payments due in 2025 2,449
Principal payments due thereafter $ 84,996