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Investments (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 457,415	$ 337,603	$ 894,806	$ 688,095
Investment expense	(13,181)	(9,269)	(25,441)	(18,821)
Investment income, net of related expenses	444,234	328,334	869,365	669,274
Fixed maturity securities available-for-sale
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	240,590	193,388	479,834	384,806
Mortgage loans on real estate
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	28,362	16,000	56,605	30,966
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	15,450	16,334	33,360	33,117
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	159,212	62,992	296,471	178,006
Short-term investments
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	422	781	1,235	1,769
Investment receivable
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue		36,752		36,752
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 13,379	$ 11,356	$ 27,301	$ 22,679