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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - 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] | Noncontrolling interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total shareholders' equity at Dec. 31, 2013 |  |  | $ 627,843 | $ 2,174 | $ 2,240,125 | $ 117,825 | $ 124,945 | $ (7,120) | $ 5,062,706 | $ (2,232,711) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 0 | 17 | 158 |  |  |  |  |  |
Shares repurchased |  |  | 0 |  |  |  |  |  | 0 |  |
Cost of treasury shares reissued |  |  |  |  | (12,054) |  |  |  |  | 12,054 |
Issue costs on newly issued preferred shares |  |  |  |  | 0 |  |  |  |  |  |
Stock options exercised |  |  |  |  | 5,405 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 51,382 |  |  |  |  |  |
Unrealized gains (losses) arising during the year, net of reclassification adjustment | $ (153,137) |  |  |  |  |  | (153,137) |  |  |  |
Non-credit portion of OTTI losses |  |  |  |  |  |  | 0 |  |  |  |
Foreign currency translation adjustment | (10,262) |  |  |  |  |  |  | (10,262) |  |  |
Net income | 804,564 |  |  |  |  |  |  |  | 804,564 |  |
Amounts attributable from noncontrolling interests | 6,181 |  |  |  |  |  |  |  | 6,181 |  |
Preferred share dividends |  |  |  |  |  |  |  |  | (40,088) |  |
Common share dividends |  |  |  |  |  |  |  |  | (117,859) |  |
Shares repurchased for treasury |  |  |  |  | 0 |  |  |  |  | (543,202) |
Total shareholders' equity at Dec. 31, 2014 | $ 5,879,940 | $ 5,821,121 | 627,843 | 2,191 | 2,285,016 | (45,574) | (28,192) | (17,382) | 5,715,504 | (2,763,859) | $ 58,819
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in usd per share) | $ 1.10 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 0 | 11 | 3,416 |  |  |  |  |  |
Shares repurchased |  |  | 0 |  |  |  |  |  | 0 |  |
Cost of treasury shares reissued |  |  |  |  | (17,958) |  |  |  |  | 17,958 |
Issue costs on newly issued preferred shares |  |  |  |  | 0 |  |  |  |  |  |
Stock options exercised |  |  |  |  | 559 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 30,355 |  |  |  |  |  |
Unrealized gains (losses) arising during the year, net of reclassification adjustment | $ (121,393) |  |  |  |  |  | (121,393) |  |  |  |
Non-credit portion of OTTI losses |  |  |  |  |  |  | 0 |  |  |  |
Foreign currency translation adjustment | (21,498) |  |  |  |  |  |  | (21,498) |  |  |
Net income | 641,631 |  |  |  |  |  |  |  | 641,631 |  |
Amounts attributable from noncontrolling interests | 0 |  |  |  |  |  |  |  | 0 |  |
Preferred share dividends |  |  |  |  |  |  |  |  | (40,069) |  |
Common share dividends |  |  |  |  |  |  |  |  | (122,713) |  |
Shares repurchased for treasury |  |  |  |  | (60,000) |  |  |  |  | (264,538) |
Total shareholders' equity at Dec. 31, 2015 | $ 5,866,882 | 5,866,882 | 627,843 | 2,202 | 2,241,388 | (188,465) | (149,585) | (38,880) | 6,194,353 | (3,010,439) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in usd per share) | $ 1.22 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 550,000 | 4 | 220 |  |  |  |  |  |
Shares repurchased |  |  | (51,769) |  |  |  |  |  | (1,309) |  |
Cost of treasury shares reissued |  |  |  |  | (19,303) |  |  |  |  | 20,691 |
Issue costs on newly issued preferred shares |  |  |  |  | (18,055) |  |  |  |  |  |
Stock options exercised |  |  |  |  | 0 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 35,607 |  |  |  |  |  |
Unrealized gains (losses) arising during the year, net of reclassification adjustment | $ 67,262 |  |  |  |  |  | 67,262 |  |  |  |
Non-credit portion of OTTI losses |  |  |  |  |  |  | 0 |  |  |  |
Foreign currency translation adjustment | (638) |  |  |  |  |  |  | (638) |  |  |
Net income | 513,368 |  |  |  |  |  |  |  | 513,368 |  |
Amounts attributable from noncontrolling interests | 0 |  |  |  |  |  |  |  | 0 |  |
Preferred share dividends |  |  |  |  |  |  |  |  | (46,597) |  |
Common share dividends |  |  |  |  |  |  |  |  | (132,188) |  |
Shares repurchased for treasury |  |  |  |  | 60,000 |  |  |  |  | (571,805) |
Total shareholders' equity at Dec. 31, 2016 | $ 6,272,370 | $ 6,272,370 | $ 1,126,074 | $ 2,206 | $ 2,299,857 | $ (121,841) | $ (82,323) | $ (39,518) | $ 6,527,627 | $ (3,561,553) | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in usd per share) | $ 1.43 |  |  |  |  |  |  |  |  |  |

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