Investments, Gain (Loss) on Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses) and OTTI on investments	$ 1,259	$ 77,561
Gross realized gains, gross realized losses and impairment losses [Abstract]
Gains on sales	1,934	80,035
Losses on sales	(675)	(2,474)
Impairment losses	0	0
Total net realized gains (losses)	1,259	77,561
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses) and OTTI on investments	1,257	75,339
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses) and OTTI on investments	2	382
Other [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses) and OTTI on investments	$ 0	$ 1,840