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Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income (loss) | $ 1,379,083 | $ 514,151 | $ 1,009,461
Change in other assets and liabilities, net | (289,562) | (99,171) | 4,950
Amortization of bond premium (accrual of bond discount) | 75,777 | 49,673 | 30,936
Realized capital losses (gains) | (257,943) | (267,649) | (185,004)
Non-cash compensation expense | 43,406 | 39,209 | 34,018
Net cash provided by (used in) operating activities | 3,833,342 | 2,873,579 | 1,852,002
Proceeds from fixed maturities sold - available for sale, at market value | 1,915,916 | 1,945,867 | 3,280,237
Distributions from other invested assets | 257,233 | 309,912 | 284,558
Cost of fixed maturities acquired - available for sale, at market value | (8,825,315) | (7,189,301) | (6,613,917)
Cost of other invested assets acquired | (756,560) | (557,473) | (425,438)
Net change in short-term investments | (42,630) | (717,527) | (167,290)
Net cash provided by (used in) investing activities | (3,868,964) | (3,683,371) | (1,412,492)
Purchase of treasury shares | (225,136) | (200,020) | (24,604)
Dividends paid to shareholders | (246,699) | (249,097) | (234,322)
Net cash provided by (used in) financing activities | 674,193 | 800,220 | (275,687)
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income (loss) | 1,379,083 | 514,151 | 1,009,461
Equity in retained (earnings) deficit of subsidiaries | (1,416,451) | (535,866) | (1,026,233)
Change in other assets and liabilities, net | 2,676 | (21,145) | 564
Increase (decrease) in due to/from affiliate | 8,176 | (8,621) | (2,209)
Amortization of bond premium (accrual of bond discount) |  | (14) | (9)
Realized capital losses (gains) |  | (28) | 66
Non-cash compensation expense | 2,481 | 2,588 | 2,796
Net cash provided by (used in) operating activities | 295,965 | 601,065 | 584,436
Additional investment in subsidiaries | (119,598) | (138,320) | (478,125)
Proceeds from fixed maturities matured/called - available for sale, at market value | 3 | 1,356 | 63
Proceeds from fixed maturities sold - available for sale, at market value |  | 200,264 | 74,841
Distributions from other invested assets | 606,648 | 559,767 | 644,918
Cost of fixed maturities acquired - available for sale, at market value |  |  | (200,267)
Cost of other invested assets acquired | (535,499) | (800,828) | (686,528)
Net change in short-term investments |  |  |
Net cash provided by (used in) investing activities | (48,446) | (177,761) | (645,098)
Common shares issued during the period, net | 26,685 | 23,185 | 22,861
Purchase of treasury shares | (225,136) | (200,020) | (24,604)
Dividends paid to shareholders | (246,699) | (249,056) | (234,322)
Proceeds from issuance (cost of repayment) of long term note payable - affiliated | 200,000 |  | 300,000
Net cash provided by (used in) financing activities | (245,150) | (425,891) | 63,935
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  |  |
Net increase (decrease) in cash | 2,369 | (2,587) | 3,273
Cash, beginning of period | 884 | 3,471 | 198
Cash, end of period | 3,253 | 884 | 3,471
Bermuda Re [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends received from subsidiaries | $ 320,000 | $ 650,000 | $ 600,000

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