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Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - Common Stock [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance, beginning of period
Total (gains) or losses (realized/unrealized) Included in earnings
Total (gains) or losses (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements 9,877 9,877
Transfers in and/or (out) of Level 3
Balance, end of period 9,877 9,877
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date