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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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