UNAUDITED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands	Total	Ordinary Shares	Additional Paid in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)	Non-controlling Interest in Equity of Consolidated Subsidiaries
Balance, beginning of year at Dec. 31, 2011		$ 3,156	$ 8,938,679	$ 583,065	$ (113,241)	$ 1,344,472
Issuance of ordinary shares		9	1,376
Buybacks of ordinary shares		(109)	(225,869)		0
Exercise of stock options		1
Exercise of stock options			1,349
Share-based compensation expense			22,669
Change in net unrealized gains (losses) on investments, net of tax	321,658			321,658
Change in net unrealized gains (losses) on affiliate and other investments, net of tax	16,383			16,383
Change in OTTI losses recognized in other comprehensive income, net of tax	26,417			26,417
Change in underfunded pension liability	(7)			(7)
Change in value of cash flow hedge	220			220
Foreign currency translation adjustments	(36,966)			(36,966)
Net income (loss) attributable to ordinary shareholders	397,782				397,782
Dividends on ordinary shares					(68,756)
Non-controlling interests - contribution						1,500
Non-controlling interests - distribution						0
Non-controlling interests						(12)
Non-controlling interest share in change in accumulated other comprehensive income (loss)						33
Non-controlling interests - deconsolidation						0
Balance, end of year at Jun. 30, 2012	11,213,809	3,057	8,738,204	910,770	215,785	1,345,993
Balance, beginning of year at Dec. 31, 2012	11,856,402	2,987	8,584,752	1,520,020	402,318	1,346,325
Issuance of ordinary shares		11	13
Buybacks of ordinary shares	(373,300)	(129)	(360,201)		(15,092)
Exercise of stock options		5
Exercise of stock options			8,380
Share-based compensation expense			17,620
Change in net unrealized gains (losses) on investments, net of tax	(827,401)			(827,401)
Change in net unrealized gains (losses) on affiliate and other investments, net of tax	25,642			25,642
Change in OTTI losses recognized in other comprehensive income, net of tax	19,620			19,620
Change in underfunded pension liability	295			295
Change in value of cash flow hedge	220			220
Foreign currency translation adjustments	(27,636)			(27,636)
Net income (loss) attributable to ordinary shareholders	623,487				623,487
Dividends on ordinary shares					(82,341)
Non-controlling interests - contribution						0
Non-controlling interests - distribution						(37)
Non-controlling interests						82
Non-controlling interest share in change in accumulated other comprehensive income (loss)						(29)
Non-controlling interests - deconsolidation						(1,841)
Balance, end of year at Jun. 30, 2013	$ 11,237,070	$ 2,874	$ 8,250,564	$ 710,760	$ 928,372	$ 1,344,500