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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Convertible non-voting common equivalent preferred shares | Non-cumulative preferred shares | Common shares | Additional paid-in capital | Retained earnings | Retained earnings Cumulative Effect, Period of Adoption, Adjustment | Retained earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated other comprehensive income (loss) | Unrealized appreciation (decline) in value of available-for-sale investments, net of deferred income tax | Unrealized appreciation (decline) in value of available-for-sale investments, net of deferred income tax Cumulative Effect, Period of Adoption, Adjustment | Unrealized appreciation (decline) in value of available-for-sale investments, net of deferred income tax Cumulative Effect, Period of Adoption, Adjusted Balance | Foreign currency translation adjustments, net of deferred income tax | Common shares held in treasury, at cost
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2017 |  | $ 489,627 | $ 872,555 | $ 611 | $ 1,230,617 | $ 8,562,889 |  | $ 8,712,683 | $ 118,044 | $ 157,400 |  | $ 7,606 | $ (39,356) | $ (2,077,741)
Balance at beginning of year (Accounting Standards Update 2016-01) at Dec. 31, 2017 |  |  |  |  |  |  | $ 149,794 |  |  |  | $ (149,794) |  |  |
Preferred shares issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred shares redeemed |  |  | (92,555) |  |  |  |  |  |  |  |  |  |  |
Preferred shares converted to common shares |  | (489,627) |  |  | 489,608 |  |  |  |  |  |  |  |  |
Amortization of share-based compensation |  |  |  |  | 55,920 |  |  |  |  |  |  |  |  |
Common shares issued, net |  |  |  | 23 |  |  |  |  |  |  |  |  |  |
Other changes |  |  |  |  | 17,636 |  |  |  |  |  |  |  |  |
Net income | $ 727,821 |  |  |  |  | 727,821 |  |  |  |  |  |  |  |
Net (income) loss attributable to noncontrolling interests | 30,150 |  |  |  |  | 30,150 |  |  |  |  |  |  |  |
Preferred share dividends | (41,645) |  |  |  |  | (41,645) |  |  |  |  |  |  |  |
Loss on redemption of preferred shares | (2,710) |  |  |  |  | (2,710) |  |  |  |  |  |  |  |
Unrealized holding gains (losses) during period, net of reclassification adjustment |  |  |  |  |  |  |  |  |  | (125,484) |  |  |  |
Unrealized holding gains (losses) during period attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 3,700 |  |  |  |
Foreign currency translation adjustments | (24,830) |  |  |  |  |  |  |  |  |  |  |  | (24,830) |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | (356) |
Shares repurchased for treasury | (282,762) |  |  |  |  |  |  |  |  |  |  |  |  | (304,426)
Balance at end of year at Dec. 31, 2018 | 9,439,827 | 0 | 780,000 | 634 | 1,793,781 | 9,426,299 | 0 | 9,426,299 | (178,720) | (114,178) | 0 | (114,178) | (64,542) | (2,382,167)
Non-redeemable noncontrolling interests | 791,560 |  |  |  |  |  |  |  |  |  |  |  |  |
Total shareholders' equity | 10,231,387 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred shares redeemed |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred shares converted to common shares |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |
Amortization of share-based compensation |  |  |  |  | 64,152 |  |  |  |  |  |  |  |  |
Common shares issued, net |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Other changes |  |  |  |  | 31,750 |  |  |  |  |  |  |  |  |
Net income | 1,693,300 |  |  |  |  | 1,693,300 |  |  |  |  |  |  |  |
Net (income) loss attributable to noncontrolling interests | (56,981) |  |  |  |  | (56,981) |  |  |  |  |  |  |  |
Preferred share dividends | (41,612) |  |  |  |  | (41,612) |  |  |  |  |  |  |  |
Loss on redemption of preferred shares | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Unrealized holding gains (losses) during period, net of reclassification adjustment |  |  |  |  |  |  |  |  |  | 381,830 |  |  |  |
Unrealized holding gains (losses) during period attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (9,166) |  |  |  |
Foreign currency translation adjustments | 18,110 |  |  |  |  |  |  |  |  |  |  |  | 18,110 |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 37 |
Shares repurchased for treasury | (2,871) |  |  |  |  |  |  |  |  |  |  |  |  | (23,880)
Balance at end of year at Dec. 31, 2019 | 11,497,371 | 0 | 780,000 | 638 | 1,889,683 | 11,021,006 | (22,500) | $ 10,998,554 | 212,091 | 258,486 | $ 0 | $ 258,486 | (46,395) | (2,406,047)
Balance at end of year (Accounting Standards Update 2016-13) at Dec. 31, 2019 |  |  |  |  |  |  | $ (22,452) |  |  |  |  |  |  |
Non-redeemable noncontrolling interests | 762,777 |  |  |  |  |  |  |  |  |  |  |  |  |
Total shareholders' equity | 12,260,148 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred shares redeemed |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred shares converted to common shares |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |
Amortization of share-based compensation |  |  |  |  | 70,535 |  |  |  |  |  |  |  |  |
Common shares issued, net |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Other changes |  |  |  |  | 17,576 |  |  |  |  |  |  |  |  |
Net income | 1,465,711 |  |  |  |  | 1,465,711 |  |  |  |  |  |  |  |
Net (income) loss attributable to noncontrolling interests | (60,190) |  |  |  |  | (60,190) |  |  |  |  |  |  |  |
Preferred share dividends | (41,612) |  |  |  |  | (41,612) |  |  |  |  |  |  |  |
Loss on redemption of preferred shares | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Unrealized holding gains (losses) during period, net of reclassification adjustment |  |  |  |  |  |  |  |  |  | 252,530 |  |  |  |
Unrealized holding gains (losses) during period attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (9,721) |  |  |  |
Foreign currency translation adjustments | 33,336 |  |  |  |  |  |  |  |  |  |  |  | 33,336 |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 659 |
Shares repurchased for treasury | (83,472) |  |  |  |  |  |  |  |  |  |  |  |  | (97,862)
Balance at end of year at Dec. 31, 2020 | 13,105,886 | $ 0 | $ 780,000 | $ 643 | $ 1,977,794 | $ 12,362,463 |  |  | $ 488,895 | $ 501,295 |  |  | $ (12,400) | $ (2,503,909)
Non-redeemable noncontrolling interests | 823,007 |  |  |  |  |  |  |  |  |  |  |  |  |
Total shareholders' equity | $ 13,928,893 |  |  |  |  |  |  |  |  |  |  |  |  |

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