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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Preferred shares | Common shares (par value) | Additional paid-in capital | Accumulated other comprehensive income (loss) | Unrealized gains (losses) on available for sale investments, net of tax: | Cumulative foreign currency translation adjustments, net of tax: | Retained earnings | Treasury shares, at cost
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02 |  |  |  |  |  | $ 0 |  | $ 0 |
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01 |  |  |  |  |  | 0 |  | 0 |
Total shareholders’ equity at Dec. 31, 2016 |  | $ 1,126,074 | $ 2,206 | $ 2,299,857 | $ (121,841) | (82,323) | $ (39,518) | 6,527,627 | $ (3,561,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Treasury shares reissued |  |  |  | (37,363) |  |  |  |  | 38,248
Shares repurchased |  |  |  |  |  |  |  |  | (151,242)
Share-based compensation expense |  |  |  | 14,177 |  |  |  |  |
Unrealized gains (losses) arising during the period | $ 92,671 |  |  |  |  | 92,671 |  |  |
Foreign currency translation adjustment | 29,869 |  |  |  |  |  | 29,869 |  |
Net income | 19,855 |  |  |  |  |  |  | 19,855 |
Preferred share dividends |  |  |  |  |  |  |  | (14,841) |
Common share dividends |  |  |  |  |  |  |  | (33,379) |
Total shareholders’ equity at Mar. 31, 2017 | 6,230,365 | 1,126,074 | 2,206 | 2,276,671 | 699 | 10,348 | (9,649) | 6,499,262 | (3,674,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02 |  |  |  |  |  | 2,142 |  | (2,142) |
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01 |  |  |  |  |  | (69,604) |  | 69,604 |
Total shareholders’ equity at Dec. 31, 2017 | 5,341,264 | 775,000 | 2,206 | 2,299,166 | 92,382 | 89,962 | 2,420 | 5,979,666 | (3,807,156)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Treasury shares reissued |  |  |  | (19,272) |  |  |  |  | 20,933
Shares repurchased |  |  |  |  |  |  |  |  | (7,163)
Share-based compensation expense |  |  |  | 9,603 |  |  |  |  |
Unrealized gains (losses) arising during the period | (111,406) |  |  |  |  | (111,406) |  |  |
Foreign currency translation adjustment | 1,270 |  |  |  |  |  | 1,270 |  |
Net income | 73,202 |  |  |  |  |  |  | 73,202 |
Preferred share dividends |  |  |  |  |  |  |  | (10,656) |
Common share dividends |  |  |  |  |  |  |  | (33,380) |
Total shareholders’ equity at Mar. 31, 2018 | $ 5,264,395 | $ 775,000 | $ 2,206 | $ 2,289,497 | $ (85,216) | $ (88,906) | $ 3,690 | $ 6,076,294 | $ (3,793,386)

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