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Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Fair Value [Abstract]        
Balance, beginning of period     $ 11,958 $ 12,477
Total (gains) or losses (realized/unrealized) Included in earnings     (6,374) (520)
Total (gains) or losses (realized/unrealized) Included in other comprehensive income (loss)    
Transfers in and/or (out) of Level 3    
Purchases, issuances and settlements    
Balance, end of period     $ 5,584 $ 11,958
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