| Senior Unsecured Notes (Narrative) (Details) $ in Millions | May 06, 2021  USD ($) | 
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| Senior Unsecured Notes [Member] | Subsequent Event [Member] | |
| Debt Instrument [Line Items] | |
| Repayments of senior unsecured notes | $ 20 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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