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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Parent [Member] | Preferred shares [Member] | Common shares (par value) [Member] | Additional paid-in capital [Member] | Accumulated other comprehensive income [Member] | Unrealized gains (losses) on available for sale investments, net of tax [Member] | Cumulative foreign currency translation adjustments, net of tax [Member] | Retained earnings [Member] | Treasury shares, at cost [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total shareholders’ equity at Dec. 31, 2015 |  |  | $ 627,843 | $ 2,202 | $ 2,241,388 | $ (188,465) | $ (149,585) | $ (38,880) | $ 6,194,353 | $ (3,010,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  | (2,843) |  |  |  |  |  |  |
Shares issued |  |  |  | 4 | (4) |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (19,647) |  |  |  |  | 21,033
Shares repurchased for treasury |  |  |  |  | 60,000 |  |  |  |  | (449,086)
Share-based compensation expense |  |  |  |  | 26,129 |  |  |  |  |
Unrealized gains arising during the period, net of reclassification adjustment | $ 281,276 |  |  |  |  |  | 281,276 |  |  |
Foreign currency translation adjustment | 5,694 |  |  |  |  |  |  | 5,694 |  |
Net income (loss) | 364,460 |  |  |  |  |  |  |  | 364,460 |
Preferred share dividends |  |  |  |  |  |  |  |  | (29,906) |
Common share dividends |  |  |  |  |  |  |  |  | (98,334) |
Total shareholders’ equity at Sep. 30, 2016 |  | $ 6,025,658 | 625,000 | 2,206 | 2,307,866 | 98,505 | 131,691 | (33,186) | 6,430,573 | (3,438,492)
Total shareholders’ equity at Dec. 31, 2016 | 6,272,370 |  | 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] |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  | (351,074) |  |  |  |  |  |  |
Shares issued |  |  |  | 0 | 0 |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (39,033) |  |  |  |  | 39,917
Shares repurchased for treasury |  |  |  |  | 0 |  |  |  |  | (285,659)
Share-based compensation expense |  |  |  |  | 30,692 |  |  |  |  |
Unrealized gains arising during the period, net of reclassification adjustment | 216,630 |  |  |  |  |  | 216,630 |  |  |
Foreign currency translation adjustment | 46,824 |  |  |  |  |  |  | 46,824 |  |
Net income (loss) | (341,541) |  |  |  |  |  |  |  | (341,541) |
Preferred share dividends |  |  |  |  |  |  |  |  | (36,154) |
Common share dividends |  |  |  |  |  |  |  |  | (98,273) |
Total shareholders’ equity at Sep. 30, 2017 | $ 5,454,699 | $ 5,454,699 | $ 775,000 | $ 2,206 | $ 2,291,516 | $ 141,613 | $ 134,307 | $ 7,306 | $ 6,051,659 | $ (3,807,295)

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