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Fair Value Measurements (Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 755 $ 532
Realized and unrealized gains recognized in earnings, net (1,252) (1,794)
Purchases 562 1,562
Issuances (45) (45)
Settlements 422 187
Ending balance $ 442 $ 442