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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | Preference Shares | Common Shares | Additional Paid-In Capital | Accumulated Other Comprehensive (Loss) Income | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning of period at Dec. 31, 2015 |  | $ 400,000 | $ 43,701 | $ 507,674 | $ 2,108 | $ 3,778,701
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of shares |  |  | (2,420) | (269,847) |  |
Exercise of options and issuance of restricted stock awards |  |  | 215 | 5,465 |  |
Change in redeemable noncontrolling interests |  |  |  | (731) |  |
Change in net unrealized gains on investments |  |  |  |  | 229 |
Net income | $ 350,737 |  |  |  |  | 350,737
Net income attributable to redeemable noncontrolling interests | (75,226) |  |  |  |  | (75,226)
Dividends on common shares |  |  |  |  |  | (26,198)
Dividends on preference shares | (11,191) |  |  |  |  | (11,191)
End of period at Jun. 30, 2016 | 4,703,217 | 400,000 | 41,496 | 242,561 | 2,337 | 4,016,823
Beginning of period at Dec. 31, 2016 | 4,866,577 | 400,000 | 41,187 | 216,558 | 1,133 | 4,207,699
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of shares |  |  | (1,052) | (148,608) |  |
Exercise of options and issuance of restricted stock awards |  |  | 147 | (61) |  |
Change in redeemable noncontrolling interests |  |  |  | (306) |  |
Change in net unrealized gains on investments |  |  |  |  | (1,272) |
Net income | 346,624 |  |  |  |  | 346,624
Net income attributable to redeemable noncontrolling interests | (71,939) |  |  |  |  | (71,939)
Dividends on common shares |  |  |  |  |  | (25,877)
Dividends on preference shares | (11,191) |  |  |  |  | (11,191)
End of period at Jun. 30, 2017 | $ 4,955,255 | $ 400,000 | $ 40,282 | $ 67,583 | $ (139) | $ 4,447,529

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