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Fair Value Measurements (Summary Of Changes In Level 3 Investments Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, beginning of period $ 45,992 $ 53,728
Purchases 90,000 0
Sales (1,364) (6,869)
Net investment losses on Level 3 investments (3,321) (2,047)
Transfers into level 3 0 0
Transfers out of level 3 0 0
Equity securities, end of period $ 131,307 $ 44,812