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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Preferred shares | Common shares (par value) | Additional paid-in capital | Accumulated other comprehensive income (loss) | Unrealized gains (losses) on available for sale investments, net of tax: | Cumulative foreign currency translation adjustments, net of tax: | Retained earnings | Treasury shares, at cost
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02 |  |  |  |  |  | $ 0 |  | $ 0 |
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01 |  |  |  |  |  | 0 |  | 0 |
Balance at beginning of period at Dec. 31, 2016 |  | $ 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) |  |  |  |  |  |  |
Treasury shares reissued |  |  |  | (39,033) |  |  |  |  | 39,917
Share-based compensation expense |  |  |  | 30,692 |  |  |  |  |
Unrealized gains (losses) arising during the period | $ 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) |
Shares repurchased |  |  |  |  |  |  |  |  | (285,659)
Balance at end of period at Sep. 30, 2017 | 5,454,699 | 775,000 | 2,206 | 2,291,516 | 141,613 | 134,307 | 7,306 | 6,051,659 | (3,807,295)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02 |  |  |  |  |  | 2,106 |  | (2,106) |
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01 |  |  |  |  |  | (69,604) |  | 69,604 |
Balance at beginning of period at Dec. 31, 2017 | 5,341,264 | 775,000 | 2,206 | 2,299,166 | 92,382 | 89,962 | 2,420 | 5,979,666 | (3,807,156)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Shares repurchased |  | 0 |  |  |  |  |  |  |
Treasury shares reissued |  |  |  | (21,935) |  |  |  |  | 23,644
Share-based compensation expense |  |  |  | 26,876 |  |  |  |  |
Unrealized gains (losses) arising during the period | (180,332) |  |  |  |  | (180,332) |  |  |
Foreign currency translation adjustment | (6,864) |  |  |  |  |  | (6,864) |  |
Net income (loss) | 230,812 |  |  |  |  |  |  | 230,812 |
Preferred share dividends |  |  |  |  |  |  |  | (31,969) |
Common share dividends |  |  |  |  |  |  |  | (100,525) |
Shares repurchased |  |  |  |  |  |  |  |  | (8,699)
Balance at end of period at Sep. 30, 2018 | $ 5,272,272 | $ 775,000 | $ 2,206 | $ 2,304,107 | $ (162,312) | $ (157,868) | $ (4,444) | $ 6,145,482 | $ (3,792,211)

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