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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Securities [Line Items]                      
Net realized and unrealized gains (losses) on equity investments trading                 $ 95,149 $ (39,161) $ 119,544
Net realized and unrealized gains (losses) on investments $ 17,897 $ 31,938 $ 194,003 $ 170,645 $ (88,654) $ 13,630 $ (17,901) $ (82,144) 414,483 (175,069) 135,822
Fixed maturity investments                      
Gain (Loss) on Securities [Line Items]                      
Gross realized gains                 133,409 21,284 49,121
Gross realized losses                 (43,149) (91,098) (38,832)
Net realized gains (losses) on fixed maturity investments                 90,260 (69,814) 10,289
Net unrealized gains (losses) on fixed maturity investments trading                 170,183 (57,310) 8,479
Investments-related derivatives                      
Gain (Loss) on Securities [Line Items]                      
Net realized and unrealized gains (losses) on investments-related derivatives                 58,891 (8,784) (2,490)
Equity investments                      
Gain (Loss) on Securities [Line Items]                      
Net realized gains on equity investments trading sold during the period                 31,062 27,739 80,027
Net unrealized gains (losses) on equity investments trading still held at reporting date                 $ 64,087   $ 39,517
Net unrealized gains (losses) on equity investments trading still held at reporting date                   $ (66,900)