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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities, beginning of period $ 44,812 $ 151,398 $ 53,728 $ 168,809
Purchases 500 0 500 28,900
Sales 0 (6,401) (6,869) (34,653)
Total gains (losses) included in net income (loss) (7,324) (25,322) 9,371 (43,381)
Transfers into level 3 0 0 0 0
Transfers out of level 3 0 0 0 0
Equity securities, end of period $ 37,988 $ 119,675 $ 37,988 $ 119,675