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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net investment gains (losses) $ 911,243 $ 425,653 $ (770,198) $ 1,037,844  
Equity securities 5,664,247   5,664,247   $ 7,590,755
Fair value, recurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value, level 1 to level 2 transfers, amount     0 0  
Fair value, level 2 to level 1 transfers, amount     0 0  
Equity securities 5,664,247   5,664,247   $ 7,590,755
Fair value, nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets measured at fair value on a nonrecurring basis 0 0 0 0  
Liabilities measured at fair value on a nonrecurring basis $ 0 $ 0 $ 0 $ 0