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Income Taxes (Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting gain (loss) |  |  |  |  |  |  |  |  |  |  |  | $ 336,163 | $ (610,275) | $ (207,521)
Net investment income | $ 146,077 | $ 181,058 | $ 179,028 | $ 140,976 | $ 140,204 | $ 161,363 | $ 141,322 | $ 138,294 |  |  |  | 647,139 | 581,183 | 542,898
Net realized capital gains (losses) | $ 75,443 | $ (12,943) | 30,272 | 92,232 | $ (172,815) | 54,804 | 15,776 | (24,901) |  |  |  | 185,004 | (127,136) | 153,194
Net derivative gain (loss) |  |  |  |  |  |  |  |  |  |  |  | 6,374 | 520 | 9,581
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  | (32,966) | (30,672) | (25,923)
Other income (expense) |  |  | (18,225) | (3,300) |  | (13,408) | (6,573) | 17,033 | $ (21,525) | $ 10,460 | $ (2,948) | (11,034) | (24,771) | (21,215)
INCOME (LOSS) BEFORE TAXES |  |  | 372,345 | 414,544 |  | 189,471 | 51,154 | 222,612 | 786,889 | 273,766 | 463,237 | 1,098,987 | (242,182) | 419,411
Total income tax expense (benefit) |  |  | $ 39,477 | $ 59,993 |  | $ (8,910) | $ (9,633) | $ 7,426 | $ 99,470 | $ (2,207) | $ (11,117) | 89,526 | (331,223) | (63,340)
Domestic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting gain (loss) |  |  |  |  |  |  |  |  |  |  |  | 38,964 | (1,407,020) | (516,167)
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 325,179 | 283,569 | 255,310
Net realized capital gains (losses) |  |  |  |  |  |  |  |  |  |  |  | 155,609 | (90,033) | 148,099
Net derivative gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  | (13,063) | (11,035) | (7,394)
Interest, fee and bond issue cost amortization expense |  |  |  |  |  |  |  |  |  |  |  | (34,931) | (30,611) | (31,183)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  | (1,976) | (5,894) | 32,441
INCOME (LOSS) BEFORE TAXES |  |  |  |  |  |  |  |  |  |  |  | 469,782 | (1,261,024) | (118,894)
Expected tax provision at the applicable statutory rate(s) |  |  |  |  |  |  |  |  |  |  |  | 98,766 | (264,912) | (41,614)
Increase (decrease) in tax resulting from: Tax exempt income |  |  |  |  |  |  |  |  |  |  |  | (3,680) | (3,824) | (8,488)
Increase (decrease) in tax resulting from: Dividend received deduction |  |  |  |  |  |  |  |  |  |  |  | (998) | (1,520) | (4,639)
Increase (decrease) in tax resulting from: Proration |  |  |  |  |  |  |  |  |  |  |  | 1,050 | 1,150 | 1,760
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  | 6,517 | 6,517 | 10,861
Increase (decrease) in tax resulting from: Creditable foreign premium tax |  |  |  |  |  |  |  |  |  |  |  | (9,852) | (13,475) | (7,515)
Increase (decrease) in tax resulting from: Tax audit settlement |  |  |  |  |  |  |  |  |  |  |  | 1,576 | 2,094 | 11,516
Increase (decrease) in tax resulting from: U.S. rate differential on carryback of net operation losses to PY |  |  |  |  |  |  |  |  |  |  |  |  | (43,734) |
Increase (decrease) in tax resulting from: U.S. rate differential on deferred tax 2017 return to provision |  |  |  |  |  |  |  |  |  |  |  |  | (28,411) |
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC |  |  |  |  |  |  |  |  |  |  |  | (2,984) | (3,333) | (6,716)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,246
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,986)
Increase (decrease) in tax resulting from: Change in uncertain tax positions |  |  |  |  |  |  |  |  |  |  |  | (8,434) | 8,434 |
Increase (decrease) in taxes resulting from: Other |  |  |  |  |  |  |  |  |  |  |  | (3,606) | 7,579 | 1,641
Total income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 75,203 | (337,623) | (66,966)
Non-U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting gain (loss) |  |  |  |  |  |  |  |  |  |  |  | 297,199 | 796,745 | 308,646
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 321,960 | 297,614 | 287,588
Net realized capital gains (losses) |  |  |  |  |  |  |  |  |  |  |  | 29,394 | (37,103) | 5,095
Net derivative gain (loss) |  |  |  |  |  |  |  |  |  |  |  | 6,374 | 520 | 9,581
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  | (19,903) | (19,637) | (18,529)
Interest, fee and bond issue cost amortization expense |  |  |  |  |  |  |  |  |  |  |  | 3,239 | (420) | (420)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  | (9,057) | (18,877) | (53,656)
INCOME (LOSS) BEFORE TAXES |  |  |  |  |  |  |  |  |  |  |  | 629,206 | 1,018,842 | 538,305
Expected tax provision at the applicable statutory rate(s) |  |  |  |  |  |  |  |  |  |  |  | 17,205 | 9,647 | 6,843
Increase (decrease) in tax resulting from: Tax exempt income |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Dividend received deduction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Proration |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Creditable foreign premium tax |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Tax audit settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: U.S. rate differential on carryback of net operation losses to PY |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: U.S. rate differential on deferred tax 2017 return to provision |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC |  |  |  |  |  |  |  |  |  |  |  | (373) | (120) | (235)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in tax resulting from: Change in uncertain tax positions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in taxes resulting from: Other |  |  |  |  |  |  |  |  |  |  |  | (2,509) | (3,127) | (2,982)
Total income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | $ 14,323 | $ 6,400 | $ 3,626

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