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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 [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 |  |  |  | 16 | 1,138 |  |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (11,711) |  |  |  |  | 11,711 |
Stock options exercised |  |  |  |  | 3,898 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 39,660 |  |  |  |  |  |
Unrealized losses arising during the period, net of reclassification adjustment | $ (91,339) |  |  |  |  |  | (91,339) |  |  |  |
Non-credit portion of OTTI losses | 0 |  |  |  |  |  | 0 |  |  |  |
Foreign currency translation adjustment | (3,551) |  |  |  |  |  |  | (3,551) |  |  |
Net income | 633,693 |  |  |  |  |  |  |  | 633,693 |  |
Amounts attributable from noncontrolling interests | 3,365 |  |  |  |  |  |  |  | 3,365 |  |
Preferred share dividends |  |  |  |  |  |  |  |  | (30,066) |  |
Common share dividends |  |  |  |  |  |  |  |  | (87,756) |  |
Shares repurchased for treasury |  |  |  |  | 0 |  |  |  |  | (468,531) |
Total shareholders' equity at Sep. 30, 2014 | 5,880,124 | $ 5,818,489 | 627,843 | 2,190 | 2,273,110 | 22,935 | 33,606 | (10,671) | 5,581,942 | (2,689,531) | $ 61,635
Total shareholders' equity at Dec. 31, 2014 | 5,879,940 |  | 627,843 | 2,191 | 2,285,016 | (45,574) | (28,192) | (17,382) | 5,715,504 | (2,763,859) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 11 | 2,472 |  |  |  |  |  |
Cost of treasury shares reissued |  |  |  |  | (17,674) |  |  |  |  | 17,674 |
Stock options exercised |  |  |  |  | 558 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 19,906 |  |  |  |  |  |
Unrealized losses arising during the period, net of reclassification adjustment | (48,168) |  |  |  |  |  | (48,168) |  |  |  |
Non-credit portion of OTTI losses | 0 |  |  |  |  |  | 0 |  |  |  |
Foreign currency translation adjustment | (23,851) |  |  |  |  |  |  | (23,851) |  |  |
Net income | 496,838 |  |  |  |  |  |  |  | 496,838 |  |
Amounts attributable from noncontrolling interests | 0 |  |  |  |  |  |  |  | 0 |  |
Preferred share dividends |  |  |  |  |  |  |  |  | (30,066) |  |
Common share dividends |  |  |  |  |  |  |  |  | (88,379) |  |
Shares repurchased for treasury |  |  |  |  | (60,000) |  |  |  |  | (264,076) |
Total shareholders' equity at Sep. 30, 2015 | $ 5,826,366 | $ 5,826,366 | $ 627,843 | $ 2,202 | $ 2,230,278 | $ (117,593) | $ (76,360) | $ (41,233) | $ 6,093,897 | $ (3,010,261) | $ 0

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