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Investments (Net Investment Gains (Losses) and Change in Net Unrealized Gains On Available-For-Sale Investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Securities [Line Items]      
Realized gains $ 8,708 $ 7,106 $ 52,282
Realized losses 10,190 19,080 12,697
Other-than-temporary impairment losses 0 0 (7,589)
Net realized investment gains (losses) (1,482) (11,974) 39,585
Change in fair value of equity securities sold during the period [1] 38,291 20,177 6,989
Change in fair value of equity securities held at the end of the period [1] 1,564,913 (445,799) (51,877)
Change in fair value of equity securities [1] 1,603,204 (425,622) (44,888)
Net investment gains (losses) 1,601,722 (437,596) (5,303)
Change in net unrealized gains on investments included in other comprehensive income (loss) 381,890 (299,446) 1,125,440
Reserve deficiency adjustment for life and annuity benefit reserves (51,390) 0 0
Sales of fixed maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Realized gains 6,851 4,221 5,525
Realized losses 2,848 5,768 1,983
Sales of equity securities [Member]      
Gain (Loss) on Securities [Line Items]      
Realized gains [1] 0 0 40,113
Realized losses [1] 0 0 1,830
Sales of short-term investments [Member]      
Gain (Loss) on Securities [Line Items]      
Realized gains 1,457 1,604 0
Realized losses (2,999) (10,545) (699)
Other [Member]      
Gain (Loss) on Securities [Line Items]      
Realized gains 400 1,281 6,644
Realized losses 4,343 2,767 596
Fixed maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Change in net unrealized gains on investments included in other comprehensive income (loss) 429,654 (297,158) 89,741
Equity securities [Member]      
Gain (Loss) on Securities [Line Items]      
Change in net unrealized gains on investments included in other comprehensive income (loss) [1] 0 0 1,035,793
Short-term investments [Member]      
Gain (Loss) on Securities [Line Items]      
Change in net unrealized gains on investments included in other comprehensive income (loss) $ 3,626 $ (2,288) $ (94)
[1]
Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, equity securities are no longer classified as available-for-sale with unrealized gains and losses recognized in other comprehensive income; rather, all changes in the fair value of equity securities are now recognized in net income. Prior periods have not been restated to conform to the current presentation. Prior to adopting ASU No. 2016-01, the Company recorded certain investments in equity securities at estimated fair value with changes in fair value recorded in net income.