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Borrowings (Bank Of America Credit Facility) (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 08, 2021 | Aug. 07, 2020 | Mar. 06, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Contractual facility |  |  |  | $ 269,953 | $ 300,449
Bank Of America Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual facility |  |  | $ 55,000 | $ 55,000 | $ 55,000
Maturity date |  |  | Mar. 06, 2023 | Mar. 06, 2023 | Mar. 06, 2023
Bank Of America Credit Facility [Member] | Eurodollar [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread over LIBOR |  | 3.00% |  |  |
Bank Of America Credit Facility [Member] | Floor Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Spread over LIBOR |  | 1.00% |  |  |
Minimum [Member] | Bank Of America Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 2.50% |  |
Maximum [Member] | Bank Of America Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 3.00% |  |
Subsequent Event [Member] | Bank Of America Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of debt | $ 2,800 |  |  |  |

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