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Borrowings (Purchase Money Promissory Note) (Narrative) (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 18, 2019 | Sep. 30, 2021 | Dec. 31, 2020
Purchase Money Promissory Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Sep. 18, 2024 | Sep. 18, 2024 | Sep. 18, 2024
Interest rate | 5.00% |  |
Payment to repurchase shares | $ 3.5 |  |
Class A [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Shares repurchased plan, shares |  | 0 |
Class A [Member] | Purchase Money Promissory Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Shares repurchased plan, shares | 407,000 |  |
Payment to repurchase shares | $ 5.5 |  |

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