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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | Preference shares | Common stock | Additional paid-in capital | Accumulated other comprehensive income | Retained earnings
--- | --- | --- | --- | --- | --- | ---
Issuance of shares |  |  | $ 0 | $ 0 |  |
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) | (2,451) | (1,702) |  | (203,703)
Offering expenses |  |  |  | (9,144) |  |
Change in redeemable noncontrolling interest |  |  |  | 318 |  |
Exercise of options and issuance of restricted stock awards |  |  | 555 | 10,528 |  |
Change in net unrealized gains on investments | $ 9,491 |  |  |  | (9,491) |
Net income | 841,768 |  |  |  |  | 841,768
Net income attributable to noncontrolling interests | (151,144) |  |  |  |  | (151,144)
Dividends on common shares |  |  |  |  |  | (49,267)
Dividends on preference shares | (24,948) |  |  |  |  | (24,948)
End of period at Dec. 31, 2013 |  | 400,000 | 43,646 | 0 | 4,131 | 3,456,607
Statement of Changes in Stockholders' Equity |  |  |  |  |  |
Total shareholders’ equity | 3,904,384 |  |  |  |  |
Issuance of shares |  |  | 0 | 0 |  |
Issuance of shares |  | 0 |  |  |  |
Repurchase of shares |  | 0 | (5,355) | (11,702) |  | (497,175)
Offering expenses |  |  |  | 0 |  |
Change in redeemable noncontrolling interest |  |  |  | 1,274 |  |
Exercise of options and issuance of restricted stock awards |  |  | 151 | 10,428 |  |
Change in net unrealized gains on investments | 715 |  |  |  | (715) |
Net income | 686,256 |  |  |  |  | 686,256
Net income attributable to noncontrolling interests | (153,538) |  |  |  |  | (153,538)
Dividends on common shares |  |  |  |  |  | (45,912)
Dividends on preference shares | (22,381) |  |  |  |  | (22,381)
End of period at Dec. 31, 2014 | 3,865,715 | 400,000 | 38,442 | 0 | 3,416 | 3,423,857
Statement of Changes in Stockholders' Equity |  |  |  |  |  |
Total shareholders’ equity | 3,865,715 |  |  |  |  |
Issuance of shares |  |  | 7,435 | 754,384 |  |
Issuance of shares |  | 0 |  |  |  |
Repurchase of shares |  | 0 | (2,473) | (257,401) |  | 0
Offering expenses |  |  |  | 0 |  |
Change in redeemable noncontrolling interest |  |  |  | (762) |  |
Exercise of options and issuance of restricted stock awards |  |  | 297 | 11,453 |  |
Change in net unrealized gains on investments | 1,308 |  |  |  | (1,308) |
Net income | 542,242 |  |  |  |  | 542,242
Net income attributable to noncontrolling interests | (111,050) |  |  |  |  | (111,050)
Dividends on common shares |  |  |  |  |  | (53,967)
Dividends on preference shares | (22,381) |  |  |  |  | (22,381)
End of period at Dec. 31, 2015 | 4,732,184 | $ 400,000 | $ 43,701 | $ 507,674 | $ 2,108 | $ 3,778,701
Statement of Changes in Stockholders' Equity |  |  |  |  |  |
Total shareholders’ equity | $ 4,732,184 |  |  |  |  |

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