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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 |  |  |  |  |  | $ 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 |  | $ 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 |  |  |  |  |  |  |  |  | (8,676)
Shares reissued |  |  |  | (21,879) |  |  |  |  | 23,541
Share-based compensation expense |  |  |  | 18,346 |  |  |  |  |
Unrealized gains (losses) arising during the period, net of reclassification adjustment | $ (180,194) |  |  |  |  | (180,194) |  |  |
Foreign currency translation adjustment | (7,858) |  |  |  |  |  | (7,858) |  |
Net income | 176,719 |  |  |  |  |  |  | 176,719 |
Preferred share dividends |  |  |  |  |  |  |  | (21,313) |
Common share dividends |  |  |  |  |  |  |  | (66,945) |
Balance at end of period at Jun. 30, 2018 | 5,253,005 | 775,000 | 2,206 | 2,295,633 | (163,168) | (157,730) | (5,438) | 6,135,625 | (3,792,291)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02 |  |  |  |  |  | (36) |  | 36 |
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01 |  |  |  |  |  | 0 |  | 0 |
Balance at beginning of period at Mar. 31, 2018 |  | 775,000 | 2,206 | 2,289,497 | (85,216) | (88,906) | 3,690 | 6,076,294 | (3,793,386)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  | (1,512)
Shares reissued |  |  |  | (2,607) |  |  |  |  | 2,607
Share-based compensation expense |  |  |  | 8,743 |  |  |  |  |
Unrealized gains (losses) arising during the period, net of reclassification adjustment | (68,824) |  |  |  |  | (68,788) |  |  |
Foreign currency translation adjustment | (9,129) |  |  |  |  |  | (9,128) |  |
Net income | 103,514 |  |  |  |  |  |  | 103,514 |
Preferred share dividends |  |  |  |  |  |  |  | (10,656) |
Common share dividends |  |  |  |  |  |  |  | (33,563) |
Balance at end of period at Jun. 30, 2018 | 5,253,005 | 775,000 | 2,206 | 2,295,633 | (163,168) | (157,730) | (5,438) | 6,135,625 | (3,792,291)
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, 2018 | 5,030,071 | 775,000 | 2,206 | 2,308,583 | (177,110) | (168,365) | (8,745) | 5,912,812 | (3,791,420)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  | (9,414)
Shares reissued |  |  |  | (20,058) |  |  |  |  | 21,791
Share-based compensation expense |  |  |  | 15,067 |  |  |  |  |
Unrealized gains (losses) arising during the period, net of reclassification adjustment | 328,036 |  |  |  |  | 328,036 |  |  |
Foreign currency translation adjustment | 5,219 |  |  |  |  |  | 5,219 |  |
Net income | 285,828 |  |  |  |  |  |  | 285,828 |
Preferred share dividends |  |  |  |  |  |  |  | (21,313) |
Common share dividends |  |  |  |  |  |  |  | (68,750) |
Balance at end of period at Jun. 30, 2019 | 5,566,477 | 775,000 | 2,206 | 2,303,592 | 156,145 | 159,671 | (3,526) | 6,108,577 | (3,779,043)
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 Mar. 31, 2019 |  | 775,000 | 2,206 | 2,296,639 | 29,096 | 35,178 | (6,082) | 5,976,603 | (3,779,388)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  | (411)
Shares reissued |  |  |  | (756) |  |  |  |  | 756
Share-based compensation expense |  |  |  | 7,709 |  |  |  |  |
Unrealized gains (losses) arising during the period, net of reclassification adjustment | 124,493 |  |  |  |  | 124,493 |  |  |
Foreign currency translation adjustment | 2,556 |  |  |  |  |  |  |  |
Net income | 177,043 |  |  |  |  |  |  | 177,043 |
Preferred share dividends |  |  |  |  |  |  |  | (10,656) |
Common share dividends |  |  |  |  |  |  |  | (34,413) |
Balance at end of period at Jun. 30, 2019 | $ 5,566,477 | $ 775,000 | $ 2,206 | $ 2,303,592 | $ 156,145 | $ 159,671 | $ (3,526) | $ 6,108,577 | $ (3,779,043)

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