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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 (loss) [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 |  |  |  |  | (17,631) |  |  |  |  | 19,017
Shares repurchased for treasury |  |  |  |  | 60,000 |  |  |  |  | (323,050)
Share-based compensation expense |  |  |  |  | 18,804 |  |  |  |  |
Unrealized gains arising during the period, net of reclassification adjustment | $ 247,582 |  |  |  |  |  | 247,582 |  |  |
Foreign currency translation adjustment | 3,972 |  |  |  |  |  |  | 3,972 |  |
Net income | 177,846 |  |  |  |  |  |  |  | 177,846 |
Preferred share dividends |  |  |  |  |  |  |  |  | (19,938) |
Common share dividends |  |  |  |  |  |  |  |  | (66,458) |
Total shareholders’ equity at Jun. 30, 2016 |  | $ 5,964,183 | 625,000 | 2,206 | 2,302,557 | 63,089 | 97,997 | (34,908) | 6,285,803 | (3,314,472)
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 |  |  |  |  | (38,840) |  |  |  |  | 39,725
Shares repurchased for treasury |  |  |  |  | 0 |  |  |  |  | (282,313)
Share-based compensation expense |  |  |  |  | 22,506 |  |  |  |  |
Unrealized gains arising during the period, net of reclassification adjustment | 167,411 |  |  |  |  |  | 167,411 |  |  |
Foreign currency translation adjustment | 38,736 |  |  |  |  |  |  | 38,736 |  |
Net income | 115,542 |  |  |  |  |  |  |  | 115,542 |
Preferred share dividends |  |  |  |  |  |  |  |  | (25,497) |
Common share dividends |  |  |  |  |  |  |  |  | (65,871) |
Total shareholders’ equity at Jun. 30, 2017 | $ 5,892,695 | $ 5,892,695 | $ 775,000 | $ 2,206 | $ 2,283,523 | $ 84,306 | $ 85,088 | $ (782) | $ 6,551,801 | $ (3,804,141)

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