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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, 2012 |  |  | $ 502,843 | $ 2,146 | $ 2,179,034 | $ 362,622 | $ 348,328 | $ 14,294 | $ 4,497,789 | $ (1,764,673) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 225,000 | 28 | 3,422 |  |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (4,225) |  |  |  |  | 4,225 |
Issue costs on newly issued preferred shares |  |  |  |  | (6,551) |  |  |  |  |  |
Shares repurchased |  |  | (100,000) |  | 3,081 |  |  |  | (3,081) |  |
Stock options exercised |  |  |  |  | 16,889 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 48,475 |  |  |  |  |  |
Unrealized losses arising during the year, net of reclassification adjustment | $ (223,383) |  |  |  |  |  | (223,383) |  |  |  |
Non-credit portion of OTTI losses | 0 |  |  |  |  |  | 0 |  |  |  |
Foreign currency translation adjustment | (21,414) |  |  |  |  |  |  | (21,414) |  |  |
Net income | 727,465 |  |  |  |  |  |  |  | 727,465 |  |
Amounts attributable from noncontrolling interests | 0 |  |  |  |  |  |  |  | 0 |  |
Preferred share dividends |  |  |  |  |  |  |  |  | (40,474) |  |
Common share dividends |  |  |  |  |  |  |  |  | (118,993) |  |
Shares repurchased for treasury |  |  |  |  | 0 |  |  |  |  | (472,263) |
Total shareholders' equity at Dec. 31, 2013 | 5,867,962 | $ 5,817,962 | 627,843 | 2,174 | 2,240,125 | 117,825 | 124,945 | (7,120) | 5,062,706 | (2,232,711) | $ 50,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 0 | 17 | 158 |  |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (12,054) |  |  |  |  | 12,054 |
Issue costs on newly issued preferred shares |  |  |  |  | 0 |  |  |  |  |  |
Shares repurchased |  |  | 0 |  | 0 |  |  |  | 0 |  |
Stock options exercised |  |  |  |  | 5,405 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 51,382 |  |  |  |  |  |
Unrealized losses arising during the year, net of reclassification adjustment | (153,137) |  |  |  |  |  | (153,137) |  |  |  |
Non-credit portion of OTTI losses | 0 |  |  |  |  |  | 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] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 0 | 11 | 3,416 |  |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (17,958) |  |  |  |  | 17,958 |
Issue costs on newly issued preferred shares |  |  |  |  | 0 |  |  |  |  |  |
Shares repurchased |  |  | 0 |  | 0 |  |  |  | 0 |  |
Stock options exercised |  |  |  |  | 559 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 30,355 |  |  |  |  |  |
Unrealized losses arising during the year, net of reclassification adjustment | (121,393) |  |  |  |  |  | (121,393) |  |  |  |
Non-credit portion of OTTI losses | 0 |  |  |  |  |  | 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

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