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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, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, beginning of period $ 53,728 $ 168,809
Purchases 0 28,900
Sales (6,869) (28,252)
Total gains (losses) included in net income (loss) 2,047 (18,059)
Transfers into level 3 0 0
Transfers out of level 3 0 0
Equity securities, end of period $ 44,812 $ 151,398