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Schedule II - Condensed Financial Information of Registrant - Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2018 | Apr. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Total investments | $ 28,761,358 | $ 24,402,246 |  |  |  |
Cash | 906,448 | 726,230 | $ 646,556 |  |  |
Other assets | 1,853,579 | 1,383,788 |  |  |  |
Total assets | 43,282,297 | 37,885,361 | 32,218,329 |  |  |
Liabilities |  |  |  |  |  |
Senior notes | 2,861,113 | 1,871,626 |  |  |  |
Other liabilities | 1,510,888 | 1,513,330 |  |  |  |
Total liabilities | 29,294,856 | 25,569,809 | 21,780,650 |  |  |
Shareholders’ Equity |  |  |  |  |  |
Accumulated other comprehensive income (loss), net of deferred income tax | 488,895 | 212,091 | (178,720) |  |  | $ 118,044
Common shares held in treasury, at cost (shares: 172,280,199 and 168,997,994) | (2,500,000) |  |  |  |  |
Total shareholders' equity | 13,928,893 | 12,260,148 | $ 10,231,387 |  |  |
Total liabilities, noncontrolling interests and shareholders' equity | $ 43,282,297 | $ 37,885,361 |  |  |  |
Parenthetical information: |  |  |  |  |  |
Common shares, par value per share | $ 0.0011 | $ 0.0011 |  | $ 0.0011 | $ 0.0033 |
Common shares issued (shares) | 579,000,841 | 574,617,195 | 570,737,283 |  |  | 549,872,226
Common shares held in treasury (shares) | 172,280,199 | 168,997,994 | 168,282,449 |  |  |
Parent Company |  |  |  |  |  |
Assets |  |  |  |  |  |
Total investments | $ 172 | $ 42 |  |  |  |
Cash | 18,932 | 18,113 |  |  |  |
Investment in subsidiaries | 14,377,529 | 11,786,861 |  |  |  |
Due from Affiliates | 0 | 17 |  |  |  |
Other assets | 18,390 | 20,461 |  |  |  |
Total assets | 14,415,023 | 11,825,494 |  |  |  |
Liabilities |  |  |  |  |  |
Senior notes | 1,285,867 | 297,254 |  |  |  |
Due to subsidiaries and affiliates | 0 | 0 |  |  |  |
Other liabilities | 23,270 | 30,869 |  |  |  |
Total liabilities | 1,309,137 | 328,123 |  |  |  |
Shareholders’ Equity |  |  |  |  |  |
Non-cumulative preferred shares | 780,000 | 780,000 |  |  |  |
Common shares ($0.0011 par, shares issued: 579,000,841 and 574,617,195) | 643 | 638 |  |  |  |
Additional paid-in capital | 1,977,794 | 1,889,683 |  |  |  |
Retained earnings | 12,362,463 | 11,021,006 |  |  |  |
Accumulated other comprehensive income (loss), net of deferred income tax | 488,895 | 212,091 |  |  |  |
Common shares held in treasury, at cost (shares: 172,280,199 and 168,997,994) | (2,503,909) | (2,406,047) |  |  |  |
Total shareholders' equity | 13,105,886 | 11,497,371 |  |  |  |
Total liabilities, noncontrolling interests and shareholders' equity | $ 14,415,023 | $ 11,825,494 |  |  |  |
Parenthetical information: |  |  |  |  |  |
Common shares, par value per share | $ 0.0011 | $ 0.0011 |  |  |  |
Common shares issued (shares) | 579,000,841 | 574,617,195 |  |  |  |
Common shares held in treasury (shares) | 172,280,199 | 168,997,994 |  |  |  |

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