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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Preference Shares | Common Shares | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Retained Earnings | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning of period at Dec. 31, 2012 |  | $ 400,000 | $ 45,542 | $ 0 | $ 13,622 | $ 3,043,901 |
Statement of Changes in Stockholders' Equity |  |  |  |  |  |  |
Issuance of shares |  | 275,000 |  |  |  |  |
Repurchase of shares |  | (275,000) | (1,722) | 3,019 |  | (142,208) |
Offering expenses |  |  |  | (9,345) |  |  |
Change in noncontrolling interests |  |  |  | 622 |  |  |
Exercise of options and issuance of restricted stock awards |  |  | 571 | 5,704 |  |  |
Change in net unrealized gains on investments | (9,056) |  |  |  | (9,056) |  |
Net income | 513,326 |  |  |  |  | 513,326 |
Net income attributable to noncontrolling interests | (96,953) |  |  |  |  | (96,953) |
Dividends on common shares |  |  |  |  |  | (36,956) |
Dividends on preference shares | (19,353) |  |  |  |  | (19,353) |
Noncontrolling interest |  |  |  |  |  |  | 3,720
Total shareholders’ equity | 3,714,434 |  |  |  |  |  |
End of period at Sep. 30, 2013 |  | 400,000 | 44,391 | 0 | 4,566 | 3,261,757 |
Beginning of period at Dec. 31, 2013 | 3,904,384 | 400,000 | 43,646 | 0 | 4,131 | 3,456,607 |
Statement of Changes in Stockholders' Equity |  |  |  |  |  |  |
Issuance of shares |  | 0 |  |  |  |  |
Repurchase of shares |  | 0 | (4,996) | (5,359) |  | (468,200) |
Offering expenses |  |  |  | 0 |  |  |
Change in noncontrolling interests |  |  |  | 1,118 |  |  |
Exercise of options and issuance of restricted stock awards |  |  | 238 | 4,241 |  |  |
Change in net unrealized gains on investments | (302) |  |  |  | (302) |  |
Net income | 465,679 |  |  |  |  | 465,679 |
Net income attributable to noncontrolling interests | (109,323) |  |  |  |  | (109,323) |
Dividends on common shares |  |  |  |  |  | (34,834) |
Dividends on preference shares | (16,786) |  |  |  |  | (16,786) |
Noncontrolling interest |  |  |  |  |  |  | 0
Total shareholders’ equity | 3,735,860 |  |  |  |  |  |
End of period at Sep. 30, 2014 | $ 3,735,860 | $ 400,000 | $ 38,888 | $ 0 | $ 3,829 | $ 3,293,143 |

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