Investments (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Realized pretax gains (losses) on the sale of investments
Gains	$ 26,453	$ 10,459
Losses	(6,207)	(1,889)
Net realized investment gain	20,246	8,570
Fixed Maturity Securities [Member]
Realized pretax gains (losses) on the sale of investments
Gains	2,015	4,591
Losses	(3,038)	(1,775)
Net realized investment gain	(1,023)	2,816
Others [Member]
Realized pretax gains (losses) on the sale of investments
Gains	0	4,528
Net realized investment gain	0	4,528
Equity Securities [Member]
Realized pretax gains (losses) on the sale of investments
Gains	24,438	1,340
Losses	(3,169)	(114)
Net realized investment gain	$ 21,269	$ 1,226