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Borrowings (Bank Of America Credit Facility) (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 07, 2020 | Mar. 06, 2020 | Aug. 08, 2019 | Mar. 05, 2019 | Mar. 03, 2016 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contractual facility |  |  |  |  |  | $ 300,449 | $ 283,138
Bank Of America Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contractual facility |  | $ 55,000 |  |  | $ 55,000 | $ 55,000 | $ 55,000
Reduced leverage ratio |  |  |  |  | 0.25% |  |
Earliest period subjected to repayment of borrowings |  |  |  |  | 18 months |  |
Maturity date |  | Mar. 06, 2023 | Sep. 01, 2020 | May 01, 2020 |  | Mar. 06, 2023 | Mar. 06, 2023
Extension period |  |  | 4 months | 6 months |  |  |
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% |  |  |  |  |

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