Realized and Unrealized Investment Gains and Losses (Realized and Unrealized Investment Gains (Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Realized and Unrealized Investment Gains (Losses) [Abstract]
Fixed maturity securities, Gains	$ 48,860	$ 34,295	$ 37,595
Fixed maturity securities, Losses	(14,670)	(6,436)	(5,499)
Equity securities available for sale	70,235	97,300	90,023
Investment funds	10,976	74,777	3,762
Other gains	12,185	1,515	0
Net realized gains on investments sales	127,586	201,451	125,881
Other-than-temporary impairments	(6,042)	(4,984)	(400)
Decrease in valuation allowance	0	13,998	0
Net other-than-temporary impairments	(6,042)	9,014	(400)
Net investment gains	121,544	210,465	125,481
Income tax expense	(47,426)	(73,663)	(43,834)
Total after-tax investment gains	$ 74,118	$ 136,802	$ 81,647