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Fair Value Measurements (Reconciliations Of Level 3 Fair Value Measurements) (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Beginning of period $ 19,822 $ 885
Included in earnings 36,612 0
End of period $ 56,434 $ 885