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Fair Value Measurements (Change In The Fair Values Of Financial Instruments Categorized As Level 3) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 61 $ 532
Realized and unrealized (gains) losses recognized in earnings, net 1,158 1,893
Purchases 1,235 1,597
Issuances $ (138) (208)
Settlements   (33)
Ending balance   $ 61