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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 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 |  |  | (2,741) | (306,693) |  |
Exercise of options and issuance of restricted stock awards |  |  | 196 | 13,112 |  |
Change in redeemable noncontrolling interests |  |  |  | (1,040) |  |
Change in net unrealized gains on investments |  |  |  |  | 513 |
Cumulative effect of adoption of ASU 2016-09 (Note 2) |  |  |  |  |  | 0
Net (loss) income | $ 538,798 |  |  |  |  | 538,798
Net loss (income) attributable to redeemable noncontrolling interests | (110,867) |  |  |  |  | (110,867)
Dividends on common shares |  |  |  |  |  | (38,886)
Dividends on preference shares | (16,786) |  |  |  |  | (16,786)
End of period at Sep. 30, 2016 | 4,807,790 | 400,000 | 41,156 | 213,053 | 2,621 | 4,150,960
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 |  |  | (1,322) | (187,269) |  |
Exercise of options and issuance of restricted stock awards |  |  | 164 | 3,870 |  |
Change in redeemable noncontrolling interests |  |  |  | (307) |  |
Change in net unrealized gains on investments |  |  |  |  | (972) |
Cumulative effect of adoption of ASU 2016-09 (Note 2) |  |  |  |  |  | 2,213
Net (loss) income | (356,870) |  |  |  |  | (356,870)
Net loss (income) attributable to redeemable noncontrolling interests | 132,338 |  |  |  |  | 132,338
Dividends on common shares |  |  |  |  |  | (38,624)
Dividends on preference shares | (16,786) |  |  |  |  | (16,786)
End of period at Sep. 30, 2017 | $ 4,403,012 | $ 400,000 | $ 40,029 | $ 32,852 | $ 161 | $ 3,929,970

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